Thursday, October17, 2019

' Autohelm Raymarine: St50 Speed St50 Wind Speed'


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       Distributed by

 Any reference to Raytheon or
RTN in this manual should be
  interpreted as Raymarine.
The names Raytheon and RTN
       are owned by the
     Raytheon Company.
_- _,_... _ _   _

                                                                         ST50 SPEED
                                                                    Installation and Operation

                      Nautech Limited, Anchorage Park, Portsmouth
                             Hampshire, PO3 5TD, England.
                    Telephone (0705) 693611, Telex 86364 NAUTEC G
1.      Specifications                        2

2.      Control Head Installation             3
2.1     Siting                                3
2.2     Mounting Procedure                    3
2.3     Power Supply                          4
2.4     Connection to Adjacent Instruments    4
2.5     Connection to Separated Instruments   4
2.6     Ring Connection                       5
2.7     Connection to SeaTalk Compatible
        Autopilots                            5

3.      Transducer installation               6
3.1     Connection to Instrument
3.2     Transducer Selection                  :
3.3     Transducer Installation               6

4.      Fault Finding                         8

5.   Maintenance
5.1 Control Head
5.2 Through Hull Transducers
5.3 Cabling

6.       Operation                            10
6.1     Set Up                                10
6.1.1    Measurement Units                    10
6.1.2   Display Contrast Adjustment           11
6.2      Illumination                         11
6.3      Display Sequence - SPEED             12
6.4      Display Sequence - TRIP              12
6.5      Display Sequence - TIMER             13

7.      Log Calibration                       14
7.1     Manual Calibration                    14
7.2     Automatic Calibration                 15
1. Specifications                                                                                   2. Control Head nstallation
The ST50 Speed can be used as a stand-alone         Specifications                                                                     39mm             Note: Tlie back cover is designed to breath
                                                    0 Power Supply                                           1 lhtn (4.33111)          (1.5in)          through a duct in the cable boss to prevent
instrument or when connected to the SeaTalk
                                                                                                          1   _
bus can supply information to a Multi Function        - 11V to 16V DC at 50ma (illumination off).                                                24mm
                                                                                                                                                        moisture accumulation.
Display, a Tridata Repeater or any SeaTalk          l   Operating   Temperature
compatible Autohelm Autopilot.                        - 0C to t70c.                                                                                   2.2 Mounting Procedure (Fig. 1)
    Both the Multi Function Display and Tridata     0 Size 1lOmm (4.33in) x 1lOmm (4.33in) x                                                            The mounting surface must be smooth and flat.
Repeater have an NMEA standard output                 24mm (lin) Overall depth 39mm (1.5in).                                                            0 Use the template provided to mark the
providing speed information to other onboard        0 Computer                                                                                             centres of the two fixing holes and central
electronic equipment.                                 - 8 bit Intel Microprocessor t 8K Rom.                                                               boss.
   The timer functions operate independantly        0 Display                                                                                           Note: Adjacent units should have a 6mm (1/4in)
allowing boat speed and log information to be         - Custom dot matrix/7 segment liquid                                                              separation to allow room for the protective
displayed whilst the timer is running.                    crystal display (LCD).                                                                        covers.
                                                    l Boat Speed                                                                                        0 Drill to 4mm (5132in) diameter.
Note: It is not possible to use the ST50 Speed as     - 0 to 60 knots (depending on transducer).    2.1 Siting                                          0 Use a 50mm (2in) diameter cutter to drill the
a repeater unit without a transducer input.         0 Average Speed                                 The ST50 speed instrument is designed for              hole for the central boss 1.
   When a dedicated repeater is required use          - 0 to 60 knots.                              above or below deck installation.                   0 Screw the two fixing studs 2, into the back
the ST50 Multi Function Display.                    l Maximum Speed                                   Position where it is:                                cover.
                                                      - 0 to 60 knots, user resettable. Resets on   0 Easy to read by the helmsman.                     l Pass the cable tails through the central hole
                                                          powerdown.                                0 Reasonably well protected from physical              and secure the instrument with the thumb
                                                    . Log                                              damage.                                             nuts provided 3. (A sealing gasket 4 is already
                                                       - 0 to 9999.9nm, promenantly stored.          0 At least 230mm (gin) from a compass.                attached to the back cover).
                                                    0 Trip Log                                       0 At least 500mm (20in) from radio receiving
                                                       - 0 to 999nm, user resettable. Resets on        equipment.                                       Bracket Mounting (Fig. 2)
                                                          powerdown.                                 0 Accessable from behind to secure in place        As an alternative to surface mounting, a bracket
                                                    0 Sea Temperature                                  and run cables.                                  mounting kit (Cat. No. 9130) is available to allow
                                                        - -10C to 40C (14 to 104F).               0 Normally viewed straight on for best display     the Instruments to be bracket mounted.
                                                    l  Timer                                           legability.
                                                      - 0 to 100 hours countup.
                                                      - 10 minute countdown.
                                                      - 5 minute countdown.
                                                    0 Illumination
                                                      - 3 levels and OFF, user selectable.
                                                    0 Unit Selection
                                                      - Speed in MPH or knots, user selectable.
                                                      - Distance in NM or statute miles, user
                                                    0 Distance Lost Function
                                                       - Indicates distance lost during a Tack in
                                                          either feet or metres.

.3 Power Supply (Fig. 3)                             2.4 Connection to Adjacent                             Fig. 5                                             2.6 Ring Connection
                                                                                                                                            _,       --.
                                                     lnstruments (Fig. 4)                                   SeaTalkExtensionCable       '        -         .   insrarrarrons with a iarge number ot tnstruments
            I   0 I ransducer
                                                     Fig. 4        To Transduce1      To Transducer         Cat. No. 0131                                      on the SeaTalk bus may require a second ring
                    --                                                                     ,cz-1,           (9m (3011) supplied)                               main connection to the Power Supply to avoid
                                                                                                                                                               excessive voltage drops. This can be checked
                                                                                                                                                               using the table below:-

                                                                  Ra lalk Tails       SeaTalk Tails
                                                                                                                                                                 The second connection should be made to the
                                                     All instruments receive both power and                                                                    spare lead on the last instrument and led back
                                                     information from the SeaTalk bus. Each                                                                    to the circuit breaker.
                                                     instrument has two SeaTalk connectors (3 pm)
                                                      on short 15Omm @in) tails to allow adjacent
                                                      units to simply plug together.
                                                                                                                                                               2.7 Connection to SeaTalk
                                                                                                                                                               Compatible Autopilots (Fig. 6)
Power %&y c&e                                          2.5 Connection to Separated                                                                             If the vessels installation includes a SeaTalk
                                                                                                                                                               Compatible Autopilot the ST50 instruments may
 2m (6ft)                                              htruments (Fig. 5)
                                                                                                                                                               be connected into the SeaTalk bus at any point.
 Red                                 s12v              Separated instruments are connected using the                                                           No separate connection to the 12V power supply
 Screen                                 ov             SeaTalk Extension Cable (Cat. No. 0131). This is              Scre                                      is necessary as the instruments will receive
                                                       supplied with a SeaTalk connector fitted to each                                                        power via the bus from the autopilot course
                                                       end and with a junction box to rejoin the cable if                                                      computer.
 Jest installations only require one connection to     it is cut to ease routing or for shortening.
 he 12V power supply.                                     If preferred, any 2 core screen cable which
    This is connected to the first SeaTalk              has the following specification may be used in
 nstrument using the 2 metre cable supplied.           the place of the SeaTalk cable.
    Plug the connector into the instrument and
 ead the other end back to the vessel's
                                                                             Minimum Copper Area      AWG
 listribution panel. Cut the cable to length,
 :onnect directly to the distribution panel and         Screen                     0.5mm*             22
 jrotect with a 5A circuit breaker. Connect the         2 Cores                    0.5mm2             22
  ed wire to t 12V and the screen to OV. The                                                                                        Computer BUS
  ,ellow wire should be cut back and insulated.
    Longer runs to the power supply can be made
  rsing the SeaTalk Extension Cable (Cat. No.
  1131) which is 9m (3Oft) long.                                                                                                                                                                  To any f&her
                                                                                                                                                                                                  ST50 Instruments
                                                                                                                                                                                                  or Autopilot
                                                                                                                                                                                                  Control Units
3. Transducer Installation
3.1 Connection to instrument                              3.3 Transducer Installation                                         Installation (Fig. 9)
c+.l. PTCn C..^^A I..^l"
LOL,,JIJ"J))GG"          .._^.. , L^" ^ &"^..^A
                    111311"IIIT;IIt11(13a         ..^^"
                                                          ,,I ^,I
                                                              ai, ^^^^^
                                                                  MSCJ "^^A
                                                                        tww ,L^
                                                                             L,IC :-^l....rl:,.^^
                                                                                   1113LI "LLl"lIzi ^..^^   I:-A...:`L.
                                                                                                    3")Jpllt?"   Wllll         - n,;,,  q d111111
                                                                                                                                 "I 111 " 3.,.m/t    ,o;..\ tJll"L
                                                                                                                                                  \I,"ll',   ..:La II"lC
                                                                                                                                                                    L-I- 111
                                                                                                                                                                          :- LL-
                                                                                                                                                                             LIK --1--1-J
cable tail with connector. Each transducer is             the transducer completely before proceeding                            position and check both inside and out that
supplied with 14m (45ft) of cable and the                 with the installation.                                                 the siting is good.
connector fitted on the end simply plugs into the            Installation of the through hull type is                          l Use a 50mm (2in) diameter cutter to drill the
instrument cable tail (Fig. 7).                           described below.                                                       hole from the outside.
                                                                                                                              l Emery to remove burrs and roughen the
                                                          Siting (Fig. 8)                                                        surface to provide a good key. Clean inside
                                                                                                                                 and outside the hull removing any grease
                                                          Fig. 8
                                                                                                                                 with a weak solvent cleaner or household
                                                          Sailing Yacht

                                                                   [D                                                     +

                                                          Semi Displacement

                 43             Speed
                                                          Planing                                                                           4 Hole Size c
                                                                                                                                             50mm (2in) Dia.

        SPEED (2095) and Transducer
                                                             q--->                                                            l     Remove the paddlewheel assembly and nut
                                                                                                                                  from the through hull fitting 2 and apply
3.2 Transducer Selection                                                                                                          sealing compound 3 to the mating flange and
                                                                                                                                  up the thread 6mm (114in) greater than the
The speed transducers are selected depending
                                                           For accurate readings the transducer should be                         hull thickness.
on the hull material:-
                                                           positioned within the shaded area indicated                        l     Assemble the through hull fitting making sure
                                                           where it will be in clear flow.                                        that the arrow points forward. Do not
                                                           0 Be ahead of propellors (10% W.L. length                              overtighten the nut 1.
                                                              min.).                                                          l     Remove excess sealing compound.
                                                           l Be at least 150mm (6in) from the keel (in a                      0   Insert blanking plug ready for launch.
                                                              sailing yacht ideally ahead of the keel).                       l     Check for leaks immediately the vessel is
                                                           l Be near the centreline.                                              launched. Recheck within 8 to 24 hours.
                                                            l Be clear of other through hull fittings or
                                                              projections.                                                    Cabling
                                                            l Have sufficient clearance inside the hull to                    0 Route the cable back to the instrument.
                                                              allow the nut to be fitted.                                     0 Avoid running the cable close to flourescent
                                                            l Have 1OOmm (4in) headroom above the                               lights, engine, radio transmitting equipment
                                                              through hull fitting to allow it to be                            etc. as these may cause interference.
                                                              withdrawn.                                                      0 Keep the cable clear of the bilges and secure
                                                                                                                                at regular intervals.

4. Fault Finding                                                                                                     5. Maintenance
All Autohelm products are subject to a                                                                               5.1 Control Head                                        5.3 Cabling
`N",~~"`,"""`.-   tact
                  ."I. nrwnr(~~m
                       y'"""....`-   nrinr
                                     r...A. tn
                                            .1 narkino
                                                                                                                     a  In L&l
                                                                                                                     - ,,I  ,..%4,.;,.  ,.^..A:,:^-r rn..A^..r^+:^..
                                                                                                                                 Lcllll L"II"ILI"IIJ, cNIl"Gl1XU"II _^.,
                                                                                                                                                                     ""CIJ   I
                                                                                                                                                                             - *,,AA  r,,nn;n,Tr~L.,nr +l."^.,nl, Kl",...
                                                                                                                                                                               n""l"I",111111~~"I~JI,II""~11              ..A.^"^
and shipment. In the unlikely event that a fault                                                                       appear on the window. This will not harm the            possible and secure any coiled lengths at
does arise the following check list should help                                                                        instrument, and can be cleared by switching             regular intervals.
cure the problem.                                                                                                      on the illumination to the brightest level.           0 Avoid running cables close to flourescent
                                                                                                                     0 Never use any chemical or abrasive materials            lights, engine, radio transmitting equipment
Fault                                        Course                          Action                                    to clean your ST50 Speed Instrument. If the             etc.
                                                                                                                       instrument becomes dirty wipe clean with a            l Check cabling for chafing or damage to outer
Instrument Display Blank                      No Supply                      Check Supply
                                                                                                                       damp cloth.                                             casing, replace where necessary and
                                                                             Check Cabling and security of SeaTalk
                                                                             Check Fuse/Breaker
                                                                                                                     5.2 Through Hull Transducers
                                                                                                                     0 Periodically check the through-hull fitting for       Advice
                                                                             Return ST50 Speed for repair                                                                    Should any difficulties arise, please consult
No Speed or Temperature Information           Transducer Cabling Problem     Check Cabling and security of           0 Keep the O-rings of the Speed/Log transducer          Nautech Product Support Department in the
                                                                             Transducer Connector                      and plug well covered with Vaseline ensuring          U.K. or your own National Distributor who will
No Speed Information                          Transducer Paddle Wheel        Clean Paddle Wheel                        plug is always attached to transducer, ready          be able to provide expert assistance.
                                              fouled                                                                   for immediate use.
No exchage of information between             SeaTalk      Cabling Problem   Check security01 SeaTalk Connectors.    0 Always replace the Speed/Log transducer
SeaTalk Instruments (i.e. illumination                                       Remove Instruments one by one to          with the plug whenever the vessel is being
levels).                                                                     isolate faulty unit                       hauled out or left for long periods.
                                                                                                                     0 Frequently check Speed/Log transducer for
Failure of a groupof   Instruments in         SeaTalk Cabling/Connector      Check security of SeaTalk Connectors
                                                                                                                       fouling or damage.
the SeaTalk Chain                             problem                        between functioning and non-
                                                                             functioning Instruments
                                                                                                                     0 Clean the outside of the through hull fitting
                                                                                                                       flange, or external transducer face with a stiff
                                                                                                                       brush and protect with a single coat of anti-
                                                                                                                       fouling. Clean the paddle-wheel and exposed
                                                                                                                       end of Speed/Log transducer plug and apply
                                                                                                                       single coat of anti-fouling.
i. Operation
he ST50 Speed Instrument can be used as an          6.1 Set Up                                                                                                                    6.2   Illumination
1"I"I""clI mrA,.ln
            IIIW"IG n"
                    "I r,..rn,-.r+,.,-4
                       WllllGLlci" +,-.    n+L.*r
                                        L""LIlcil   ihe Si30 Speeci is sei up ill iile iaciory                           io                                                       Control of Illumination level is common to all
lstruments to provide part of a fully integrated    display speed in knots, distance in NM, and                                                                                   ST50 Instrument Modules. The control is always
lstrumentation system which can be linked to        distance lost in feet. These can be changed to                                                                                selected using the left-hand push button.
ny of the Autohelm SeaTalk compatible               mph, statute miles and metres to suit your                                                                                    0 Push and hold down the Speed button for 1
utopilots.                                          preference as follows:-                                                                                                           second to switch ON (if OFF), or to display
                                                     l Push and hold down for 2 seconds Speed and                             0 Push Reset to change display units between            current illumination level (if already on).
                                                        Trip together to select calibration mode.                               feet and metres.
                                                                                                                              l Push and hold down for 2 seconds Speed and
                                                                                                                                Trip together toexit calibration mode and
                                                                                                                                store the selected units.

                                                                 nulaheln                               SPEED                 6.1.2 Display Contrast Adjustment
                                                                                                                              l    The LCD viewing angle can be user set to
                                                                                .-a. .-. :
                                                                                                                                  achieve optimum display legability.
                                                                                0 L..'      !
                                                                                :.... : ! : . . . .


                                                                                                .       --


                                                                                                                              l     Momentarily push Speed and Trip together.

                                                    6.1.1 Measurement Units                                                                                                       0 Push Speed button within 8 seconds to select
                                                                                                                                                                                    required illumination level.
                                                   'II:ii;l                                                                                                   Lamp 3         High
                                                                                                                                                                                    Lamp 2         Medium
                                                                                                                                                                                    Lamp 1         Low

                                                          Push Reset to change display units between
                                                                                                        ..--I                 l    Push Reset to increase and Timer to decrease
                                                                                                                                 the contrast level.
                                                                                                                              0 Adjust for optimum contrast.
                                                                                                                                                                                    LampOFF O f f

                                                                                                                                                                                  The display will return to previous status after
                                                         knotsand      mph.    - -                                            0 Momentarily push Speed and Trip together to       8 seconds.
                                                                         nt,P                                                    store the display setting.
                                                                                                                              Note: Increasing the display setting will suit
                                                                                         Ll                                   installations where the instrument is normally
                                                                                                                              viewed from below.
                                                                     l?: : .i".

                                                                   1 ..:                                i `.;I i* * .!
                                                                  ..y   :`..:       ;    :"`,


                                                                                                                                                           ,-j7      K;ast

                                                     l     Push Reset to change display units between
                                                         nautical miles and statute miles.

                                                                                          i         1

 0                                                                                                                                                                                                                                   11

6.3 Display Sequence: SPEED                                                                                                          l   Tack                                                                         6.5 Display Sequence: TIMER
                                                                                                                                            /         "i" fIi i:-:: i.;::                                   I

                                                                                      ( IPCCD
                                                                                          ""n                       J                                                                                                                      -.-..__-
                                                                                                                                     When in Tack mode the ST50 speed instrument                                      l    Timer
l       Boat Speed                                                   l   Trip Distance                                               gives a measure of lost distance during a tack
                . . . . ,.... ....* ..:`.     ::.- ,* .                       ..:" :".* : :"`,                                                                                                                                 ..:`. : :..; :.... . . . . . . . . . :..`.
                                                                                                                                     based on the average speed over the last 30                                                     i j : j j...      c.. i... i
             j...: :,. j. .j...j
                               . : ::j         1 *..                                                                                 seconds. Push Reset just before starting the                                                 I . : : :....        .,..: i . . . . ..,a
                                                                                                                                     tack to start the distance lost function.                                                    17 ,`) 17
                                -4 -I
                                                                                                                                                                           RtSlr                                                  L!!,r,r r,(
                                                                         - Push Reset for 4 seconds to reset.                                                             I -1                                            - Push Timer to start/stop.
                                                                                                       TRIP                                             . :. .; :. . . i" ip                      -3' ":"ji               - Push Timer to freeze display (indicated by
                                      c. .J
                                                                                                                                                     I .i-.-.------e
                                                                                                                                                             . . :.. i.s,:. ;..: : *.-i *.--  -' .
                                                                                                                                                                                          .* : : *. ., y.                    flashing colon).
l       Velocity Made Good                                                                             II                                       :I-.       :
                                                                                                                                                 i.e.:: * 1. . .. ... * :1 j.:.j .' ::`,. `i ::.,:: : . j.. .. . II
                                                                     0 Log                                                                                                                                            l    Race Timer
                                                                                                                                                                                                                                            _            ._,     ~.
                                                                                .;    j.::l    :***;   "y'   i-l                                                                                                                        :-, "f' :`:I! p "[
                                                                                                                                                                                                                               .-I -- ..:-.-. ~~.?..?._`L- _-.--
                                                                                                                    1..   1 !;I

                                                                                .j*    ::.*:     "?    *..::*::-J   :     *: :   1
                                                                                                 ..                 *      a.


                                                                                                                                     a Tack the boat
                                                                                                                                       - The distance lost will now count up until
                                                                                                                                           the boat reaches its average speed on the
  - only displayed if wind data available.                                                                                                 previous tack.
l Average Boat Speed*
                                                                                                       L ---1

                                                                                                                                     0 Push Reset to reset the function ready for the                                     - Push Timer for 1 second to select 10
    ,____ -. ~~-~~~ _ ~~                                             l    Sea Temperature                                              next tack.                                                                           minute countdown.
      i-i 1 1 j">     : . . ..:.. ,....
      j-j ..*.' L**.j j.: : -...
                      : *, ! .. . . .                                                                                                                                                                                     - Push Timer for 3 seconds to select 5
                                                                                                                                     Note: The tack function should be reset at least                                       minute countdown.
                               B- 87                                                                                                 30 seconds before tacking so that the average
                               a.3                                                                                                   speed can be accurately calculated.                                              0 Push Reset at anytime to reset.
           I-.. ._._ _~~.~_~ ~.                                  ,

        - Push Reset to reset.
        - Average speed is calculated over a max.
          24 hour period after reset and then flashes.                                                                                                                                                                            ..:*. : :*.: :...*  . ..I ]"" *...,
                                                                                                                                                                                                                                     j j ' : ' j.**   . . . . j... j
                                                                                                                                                                                                                                    ;-,  I I ! L.., ,;,: . . . .*...*

l        Maximum Speed"
          .- ---                                                                                                                                                                                                                  ,,I.Lt                  r,l
              ::. :.: j ,-j.., .j :* *.* *:   j *<. . :" . . .
               ! :: :: :                      p.. j: `-.:                                                                                                                                                             Note: If timer is already running, use Timer to
                                          7 -4 .`.                                                                                                                                                                    return to timer display.
                                            L I
    - Push Reset to reset.
 *Display returns to current boat speed after
 8 seconds.
12                                                                                                                                                                                                                                                                            13
2. Log Calibration
As supplied all ST50 Instrument Modules are                          7.1 Manual Calibration Procedure                        7.2 Automatic Calibration                        l    At the start of the measured run push Speed
Tested and Calibrated to factory standards. It is                    l     Calculate Correction Factor(F).                   Procedure                                            Display shows run number and measured
""r.a. .I... .that
               . ..-. hafnrn   1tcino
                               --.. .D thic   inctrlmxd        fnr              I/^^..... A:^*....,.-                                                                             distance
                      WV."._           . ..- ., ._.. -. ..-. . .I.
                                                                         F = ~"""w"m~!~!ea~~                                 6 Seieci an easiiy ideniiiied marked measureci                       wrm
Navigation purposes the following Log                                                                                          distance on a chart.
Calibration procedures are carried out for your                                Measured distance
                                                                         Known distance                                      0 Carry out the calibration when tidal flow is                     I   1
specific installation.                                                                                                         least.
  There are two methods of log calibration.                              - From a chart
                                                                         Measured distance                                   0 Complete a minimum of two runs (one in each
0 Manual Calibration - allows a calculated log                                                                                 direction) to cancel tide.
                                                                         - As recorded on speed instrument allowing
   calibration factor to be entered manually.
 0 Automatic Calibration - allows up to four                                for tidal flow as required.
    measured runs to be entered and compared                         Procedure                                               Push and hold down for 2 seconds Speed and
   against a known distance. The log calibration
   factor is automatically calculated.
                                                                     l Push and hold down for 2 seconds Speed and            Trip together to select calibration mode,
                                                                                                                                   (______ ---. _~._
                                                                       Trip together to select calibration mode.
                                                                                   :a**. .-. :
                                                                                                                                                   i"`i i. . . .
                                                                                                                                                                                                I .I
                                                                                   *     : ::
                                                                                   *.... r-l i. . . .                                                                         l    Push Speed at the end of the run.
                                                                                                                                                                                  - Display shows recorded distance for the
                                                                                                                                   L--...--- _-._---.. . ..I                         run, and after 5 seconds the log
                                                                                                                                                    WEID                             calibration factor.

                                                                                                                                                   I I
                                                                                                                             l   Push Speed to select log calibration.
                                                                     0 Push Speed to display log calibration factor.

                                                                     0 Calculate the new log Calibration Factor.
                                                                       = Displayed calibration factor x F (min. 0.25,        0 Push Speed to display distance.
                                                                       max 1.50).
                                                                                                                                                                              l   Repeat last two stages to run the measured
                                                                                                                                                                                distance in the opposite direction.
                                                                                                                                                                              0 If required, repeat last two stages for up to 2
                                                                                                                                                                                more calibration runs over the measured
                                                                     0 Adjust the displayed calibration factor using
                                                                                                                                   L--.--                                I
                                                                       Reset to increase ( A ) or Timer to decrease ( T ).                                                    0 Push and hold down for 2 seconds Speed and
                                                                     l Push and hold down for 2 seconds Speed and                                                               Trip together to exit calibration and to store
                                                                       Trip together to exit calibration and to store                                                           the new log calibration factor.
                                                                       new calibration factor.                                                                                Note: If the calibration factor is not within 0.25
                                                                                                                             0 Adjust displayed distance using Reset to       and 1.50 a mistake has been made in the
                                                                                                                               increase ( A ) and Timer to decrease (7 ),     calibration sequence and the previous
                                                                                                                               until it equals marked measured distance       calibration factor will be retained when exiting
                                                                                                                               (minimum 0.25nm, maximum 2.50nm).              calibration mode.
                                                                                                                                                                                 The trip distance will be lost whenever
                                                                                                                                                                              automatic calibration is used.

 14                                                                                                                                                                                                                                15

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