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Any reference to Raytheon or
RTN in this manual should be
interpreted as Raymarine.
The names Raytheon and RTN
are owned by the
_- _,_... _ _ _
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
3. Transducer installation 6
3.1 Connection to Instrument
3.2 Transducer Selection :
3.3 Transducer Installation 6
4. Fault Finding 8
5.1 Control Head
5.2 Through Hull Transducers
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
bus can supply information to a Multi Function - 11V to 16V DC at 50ma (illumination off). 24mm
Display, a Tridata Repeater or any SeaTalk l Operating Temperature
compatible Autohelm Autopilot. - 0°C to t70°c. 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
- -10°C to 40°C (14 to 104°F). 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.
- 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
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
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
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
with a weak solvent cleaner or household
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
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
a In L&l
- ,,I ,..%4,.;,. ,.^..A:,:^-r rn..A^..r^+:^..
Lcllll L"II"ILI"IIJ, cNIl"Gl1XU"II _^.,
- *,,AA r,,nn;n,Tr~L.,nr +l."^.,nl, Kl",...
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
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-
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.
he ST50 Speed Instrument can be used as an 6.1 Set Up 6.2 Illumination
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.
I.tr:lii-i-K'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 :`..: ; :"`,
l Push Reset to change display units between
nautical miles and statute miles.
6.3 Display Sequence: SPEED l Tack 6.5 Display Sequence: TIMER
/ "i" fIi i:-:: i.;:: I
""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
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
. . :.. 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*
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.
- Push Reset to reset.
*Display returns to current boat speed after
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. . . .
* : ::
*.... 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.
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.
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
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.