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' Autohelm Raymarine: St50 plus Tridata Repeater Multi function St50 '




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Any reference to Raytheon or
RTN in this manual should be
interpreted as names Raytheon and RTN
are owned by the
Raytheon Company
5 I
Autohelm
TRIDATA REPEATER
Operation and
Installation
i
ST50 Plus Ttidata and Repeater Operation and Installation Handbook
Autohelm and SeaTalk are registered Trade Marks of Nautech Limited
Autohelms policy of ronnllg inppm 2nd ydatino IMU
r m Jrhannn
I8 0 nrn 1t p VU A I3
without prior notice
Copyright Nautech 1993
ST50 Pius Tridata and Repeater Operation and Installation Handbook ST50 Plus Tridata and Repeater Operation and Installation Contents
The following items are included in the ST50 Plus Tridata package
1 ST50 Plus Tridata control head
2 Fixing studs 2 offI
3 Thumb nuts 2 offI
4 Fiing template
5 Power cable
6 Speed transducer through hull with 14m 45ft of cable
7 Depth transducer through hull with 14m 45ftI of cable
8 Control head cover
Autohelm
9 Operation and Installation handbook
10 Worldwide Service Centre handbook
11 Warranty document SeaTalk
12 Securii sticker
SE0 Plus Tridata and Repeater Operation and lnstalfation Handbook
Contents
Contents
Introduction 1
Chapter 1 Control Headlnsttion 3
11 Sing 3
12 Mounting Procedure 4
13 Power Supply standabne operation 6
14 Power Supply SeaTalk operation 6
15 Connection of Separated Instruments 7
16 Ring Connection 8
17 Connection to SeaTalk Compatible Autopilots 8
Chapter 2 Transducer Installation 9
21 Connection to the Control Head 9
22 Transducer Selection 9
23 Transducer Installation 10
Chapter 3 Fault Finding and Maintenance 13
31 Fault Finding 13
32 Maintenance 14
Chapter 4 Operation 15
41 Depth Key 16
42 Speed Key 17
43TripKey 18
Chapter 5 CODE LockSecwity 21
Chapter 6 Calibration 25
61 Initial Calibration 26
62 Log Calibration 28
63 Intermediate Calibration 32
64 Extended Calibration 34
Chapter 7 Connection to other Marine Equipment 37
Chapter 8 39
ST50 Plus TMa and Repeater Operation and installation Handbook SEOUus Ttidata andRepeater Operation Handbook
Introduction
The ST50 Plus Tridata is a multifunction instrument providing
speed distance depth sea temperature and timing information
The instrument can be configured to operate as a master unit or a dedicated
repeater Settings such as log speed depth and temperature units are
stored in permanent memory and retained even when the power source is
disconnected The log function can be calibrated automatically over a
measured distance or by simple entry of a calculated calibration factor
The ST50 PlusTridata also incorporates a securii feature to protect
instruments mounted in vulnerable areas such as the cockpit helm or mast
Thank you for purchasing an Autohelm product May we take this opportunity
to wish you years of trouble free 1 Control Head 1 Control Head Installation
1lOmm 433in 3875mm 15in
11 Sing
The ST50 Plus is designed for above or below deck
installation where it is
l Easily read by the helmsman
l Protected against physical damage
l At least 230mm gin from a compass
l At least 500mm 20infrom radio receiving equipment
l Accessible from behind for ease of installation and cable running
caution
To prevent moisture forming on the display window the ST50 Plus
Therefore the control head must be sited where the rear case is
S T 5 0 P l u s Ttidata a n d R e p e a t e r O p e r a t i o n a n d I n s t a l l a t i o n H a n d b o o k Chapter 1 Control Head
The rear case is fitted with a foam gasket to form a watertight seal between Bracket
Mounting
the instrument and the selected installation face
The ST50 Plus can as an afternative be bracket mounted
using the Autohelm Mounting Kii Cat No D130
I 01250
1 Cable boss 2 Feting studs 3 Thumb nuts 4 Gasket
Note Because the instrument breathes through the vent in the rear case this
I 2 Mounting Procedure
bracket is for interior use only
1 Make surethat the selected location is clean smooth and flat Flush Mounting
2 Applythe selfadhesive template supplied to the selected location and A flush
mounting kii is available for installations where a flush mount is required
mark the centres for the fixing studs 2 and the cable boss 1 or more
desirable Full installation instructions are provided with
3 Drill two 4mm 532inI clearance holes for the fixing studs 2 through the kitCat
No D183
the bulkhead Remove the template
4 Cut the clearance hole for the cable boss 11 using a 50mm 2in
diameter cutter
5 Screw the two fixing studs 2 into the control head
6 Pass the SeaTalk cable and transducer cableboss 1
clearance hole
7 Assemble the control head to the bulkhead and secure from behind
using the thumb nuts 3
S730 Plus Tridata and Repeater Operation and Installation Handbook Chapter 1 Cono1 Head Power Supply standalone operation
15 Connection of Separated Instruments
Separated instruments can be connected using one of the range of SeaTalk
Extension Cables These cables are supplied with a SeaTalk connector fitted
to each end Ajunction box can be used to join the cable ifit is cut for easier
routing or shortening
lf preferred any 2 core screened cable comring to the following specifica
tion may be used instead of the SeaTalk cable
l 22 AWG 2 core screened cablewith a minimum copper area of 05mm2
5 Amp circuit breaker
SRed
12v supply
1 Connect the 2m 6ftI power supply cable directly to the distribution panel
2 screen to the OV terminal
3 4 Protect the circuit with a 5Acircuii breaker
Extension Cables
4 Power Supply SeaTalk operation
All instruments in a SeaTalk system receive power and information from the
SeaTalk bus Each instrument has iwo SeaTalk connectors 3 pin on
150mm 6in tails To supply power and information to the instrument simply
plug the tails from adjacent instruments into the ST50Tridata tails
To transducer
ST50 Plus Tridata and Repeater Operation and Installation Handbook Chapter 2 Transducer Ring Connection
Chapter 2 Transducer Installation
Installations with a large number of instruments on a SeaTalk bus may require
a second ringmain connection to the power supply breaker to prevent 21 Connection to the Control Head
excessive voltage drops Whether a second ring main is required can be
The ST50 PlusTridata is supplied with depth and speed transducer cable
determined from the following
tails and connectors These cable tails plug into the mating connectors fitted
Cable run upto 10m 33ft to the 14m 45ftI depth and speed
transducer cables
Single connection 13 instruments maximum
Second connection 26 instruments maximum
Cable run upto 20m 66ft
Single connection 7 instruments maximum
Second connection 13 instruments maximum
The second ringmain should be connected to the spare lead on the last
instrument in the chain and directed back to the circuit breaker
7 Connection to SeaTalk Compatible Autopilots
lf the installation includes a SeaTalk compatible Autopilot the ST50 Plus
instruments may be connected to the SeaTalk bus at any point No independ
ent connection to the 12V power supply is necessary as the instruments
receive power from the Autopilot course computer
22 Transducer Selection
The type of speed transducer used is dependent on the hull material The
following list shows the appropriate transducer for hull type
To autopilot
SeaTalk BUS Transducer Type
Hull Material
Connection
Speed
To any further
ST50 Instruments 2092 Through Hull Plastic GRP Glass Reinforced Plastic Steel and
or Autopilot Aluminium
Control Units
0134 Ll
ZllGThrough HullBronze Wood
Depth
ZO91 Through Hull Plastic GRP Glass Reinforced Plastic Steel and
Aluminium
Lll8 I nrougn Hull Bronze Wood
Z120 Retractable through hull GRP Glass Reinforced Plastic Steel and
Aluminii
ST50 Plus Tridata and Repeater Operation and Installation Handbook Chapter 2 Transducer Transducer Installation
All transducers are supplied with detailed installation and maintenance
These instructions together with the following notes should be read
thoroughly before attempting to install the transducer
Sing
For accurate speed and depth readings the transducers should be sited
within the shaded clear flow areas
Cabling
1 Run the cables back tothe control head
NoAvoid fluorescent lights engines radio transmitting equipment etc as
these may cause interference Also keep the transducer cable clear of bilges
and secure at regular intervals
2 and instrument cable connectors together To lock the
connectors push and rotate the ring cable connector
1 Sal 2 Flanning power towards the instrument connector
The transducers should also
l be ahead of the propellers 10 WL length minimum
l be at least 15Omm 6in away from the keel ideally ahead of the keel if a
sailing yacht
l be as near as possible the centreline of the vessel
l be clear of fittings or projections
l have sufficient clearance inside the hull to fit the nut
l have 1OOmm 4in of headroom to allow for withdrawal
l depth transducer be within 10 of vertical fore aft and Plus Tridata and Repeater Operation and Installation Handbook Chapter 3 Fault
Finding and Chapter 3 Fault Finding and Maintenance
31 Fault Finding
All Autohelm products are prior to packing and shipping subjected to
comprehensive test and quality assurance programmes However if a fault
arises with the ST50 Plus Tridata the following table will help to identify the
probable cause and provide the most likely cure
Fault Cause Action
instrument display No supply Check supply
blank Check cabling and
security of SeaTalk
connectors
Check
Return unit for repair
Instrument displays The Code Lock feature Enter correct code
CODE SET has been set number
No speed or Transducer cabling Check cabling and
temperature problem security of transducer
information connector
No speed information Transducer Clean paddlewheel
paddlewheel fouled
No exchange of SeaTalk cabling Check security of
information between problem SeaTalk connectors
SeaTalk instruments Disconnect instruments
one by one to isolate
faulty unit
Failure of a group of SeaTalk Check security of
instruments in SeaTalk SeaTalk connectors
chain problem and
units
Depth reading flashes Transducer Check cabling and
continuously depth security of transducer
greater than 3 feet problem connector
Depth reading flashes Aerated water Normal reading will
while underway Boat wakes return when clear of
Prop wash etc disturbed water
S T 5 0 P l u s Tridata a n d R e p e a t e r O p e r a t i o n a n d I n s t a l l a t i o n H a n d b o o k ChaDter 4 Maintenance
Chapter 4 Operation
Instrument
As it leaves the factory the ST50 Plus Tridata is set to
Certain atmospheric conditions may cause condensation to form on the l
display speed in knots
control head window This will not hamr the instrument and can be cleared by l
display depth in feet
increasing the illumination setting to Level 3
l display distance in miles
Chemical and abrasive materials must not be used to clean the ST50 Plus
master mode
instrument if it is dirty clean with a soft damp cloth
l CODE Lock switched off
Transducer
Other factory default settings are
Refer to the Installation and Maintenance instructions supplied with the
l shallow alarm set at 10 feet disabled
transducer
l deep alarm set at 100 feet disabled
Cabling
These settings can be changed in calibration Chapter 6
Examine all cables for chafing or damage to the outer shield and where
necessary replace and resecure
Advice
For advice or further information regarding the installation of this product
please contact the Autohelm product Support Department or your own
National ST50 plus Tridata and Repeater Operation and Installation Handbook Chapter 4 Depth Key
42 Speed Key
AVERAGE SPEED
LIGHTS
SHALLOW ALARM
MAXIMUM SPEED
LIGHTS
BOAT SPEED
DEPTH 1
Speed Key Notes i
The average and maximum speed displays are updated by pressing RESET
momentarily
Note Average speed cannot be reset on tie Tridata Repeater
Depth Key Notes The average and maximum speed
displayswill return to normal 8 seconds
after the last key press
The lights shallow alarm and deep alarm displays will return to normal 8
seconds after the last key press
ST50 Plus Tridata and Repeater Operation and Installation Handbook Chapter 4 Key
Trip Key Notes
Timer
The countup 10 minute and 5 minute countdown timers are started
as follows
Countup timer
Wth the timer legend displayed momentarily press RESET to start
the timer
10 minute countdown timer
Wti timer legend displayed press RESET for 1 second to access the 10
minute timer To startthe timer press 5
minute countdown timer
TIMER
With timer legend displayed press RESET for 1 second to access the 10
minute timer and then press RESET again for 1 second to access the 5
minute timer To start the timer press RESET momentarily
Freeze timers
To freeze the timer display press RESET momentarily Although the display
has been frozen the timer continues to count in the background
To return to the live timer display press the RESET key once again
Reset timer
SEA TEMPERATURE
Degrees C The 5 and 10 minute timers are reset by pressing RESET for 1 second The
countup timer is reset as follows
l Press RESET for 1 second to select the 10 minute timer
l Press RESm again for 1 second to select the 5 minute timer
SEA TEMPERATURE
Degrees F
l Finally press RESETfor 1 second to return tothe countup timer
Tiier alarms
The following alarms will sound when the 5 and 10 minute timers are running
l double beep every minute
TRIP
l beep three times at 30 seconds to zero
l beep every second from 10 seconds to zero
l beep twice when the timer reaches zero and begins to countup
NoThe timer operates globally That is if you freeze the timer on the
Tridata the timer will be frozen on all other units with a timer facility
ST50 plus Tridata and Repeater Operation and installation Handbook Chapter 5 CODE Lock can once the 5 or iU mrnute countdown timer has been
activated Chapter 5 CODE Lock to one of the main displaysThe timer will continue to operate in
The ST50 Plus range incorporates an antitheft feature called CODE
Lock Designed to protect individual instruments or complete systems in
These alarms can be switched off if required refer to para 61 Initial
vulnerable areas CODE Lock is a four digit number that you for procedures
into the permanent memory of a selected master
Note A master instrument is a digital unit on which the code number
Trip distance is cleared by pressing RESmfor 3 seconds During this period can be entered and then if part of an integrated
system transmitted to
the current trip distance will flash until it is zeroed other ST50 Plus instruments
This facility means that should a CODE Locked instrument be removed
from the vessel without your permission it cannot be operated without
the four digit securii number
CODE Lock can be used in one of three modes
Mode 1 Off
As it leaves the factory CODE Lock is set to off In this mode the
instrument will operate normally when it is switched on however the unit
will not be protected by the antitheft feature
Mode 2 CODE Lock OnceOnly Enby page 23
This mode is designed for systems with a digital ST50 Plus instrument in
a safe belowdecks location This instrument can then be used as a
master to enter the four digit code number and when the power is
switched on automatically transmit the code to all the instruments in the
system The advantage of this mode is that with the master safely below
deck code entry via the keypad is a onceonly operation on
I l5 I
Once CODE Lock is set the system will operate normally as soon as the
power is switched on In other words the CODE Lock securii number
is invisible
ST50 Plus Tridata and Repeater Operation and Installation Handbook Chaoter 5 CODE Lock Securitv
23
II I e AC n
nwx8e 3 buuc LOCK mpui ai Fewer0n page 24j Gnce Oniy Eniry
In the PowerOn mode the ST50 Plus is configured so that you have to Action
Display Shows
enter the four digit number on a master digital instrument every time the
1 Press and DEPTH and SPEED together CALafter Zsecondsand
system is switched on Until this number is entered the for 4 seconds
CAL and software
instruments will not operate
version after 4 seconds
This mode is particularly useful when you are unable to position a master 2 Press DEPTH twice
CAL CODE OFF
instrument below decks and therefore all the vessels valuable instru
3 Press SPEED
mentation is left in a vulnerable area
4 Press TRIP or RESET to select first 1
I number
5 Press SPEED to accept number 1 1I
6 Press TRIP or RESET to select second 12
number
7 Press SPEED to accept number 1 2
8 Press TRIP or RESET to select third 123
number
9 Press SPEED to accept third number 1 2 3
10 Press TRIP or RESET to select fourth 1234
number
11 Press SPEED to accept code 1234
Should a CODE Locked instrument be removed from the system it will
12 Press SPEED S
not operate until the correct four digit security number is entered or
received 13 To exit CODELOCK press DEPTH and
Normal operation eg
SPEED together for 2 seconds speed and depth
If your selected master instrument fails for any reason the security code
displavs
number can be entered via another ST50 Plus instrument in the system
However until another instrument is set as a master or the existing
Note If you wish to cancel the code or change the number simply re
master is replaced the security code will have to be entered every time
enter and accept the current number
the system is switched on
Your Code Number
Note A warning sticker is provided with each instrument If you have set
CODE Lock position this warning sticker in a prominent location to deter For future reference enter your chosen code
number into the following
potential thieves box
Setting Up the Security Code i
When the ST50 Plus Tridata is switchedon for the first time the security
feature is set to off To turn the CODE Lock feature on proceed as For obvious reasons please store this
handbook in a safe place
follows
Operation
Once only CODE Lock entry is invisible once it has been set
ST50 Plus Ttidata and Repeater Operation and Installation Handbook Chapter 6 Calibration
25
8n Fewertip Chapter 6 Calibration
Action Display Shows As it leaves the factory the ST50 Plus Tridata
is set to display speed in knots
1 Press and DEPTH and SPEED together CAL after 2 seconds and distance in Nm and depth units in feet
These settings together and other
for 4 seconds CAL and software navigational features can be changed eg feet to
metres as described in this
number after 4 seconds Section
2 Press DEPTH twice CAL CODE OFF c
3 Press SPEED
4 Press TRIP or RESET to select first 1
number
5 Press SPEED t o accept number 11I
6 Press TRIP or RESET to select second 12
number
7 Press SPEED to accept number 1 2
8 Press TRIP or RESET to select third 123
number
9 Press SPEED to accept third number 123
10 Press TRIP or RESET to select fourth 1 23 4
number
12 Press SPEED to accept code 1234
13 Press SPEED S
14 Press SPEED CAL CODE SET
15 To exit CODELOCK press DEPTH and Normal operation eg
SPEED together for 2 seconds speed and depth
displays
T1291
Note lf you wish to cancel the code or change the number simply re
enter and accept the current number
Your Code Number
For future reference enter your chosen code number into the box obvious reasons please store this handbook in a safe the unit is powered on you are
prompted to enter the code number
To enter the number carry out actions 3 to 12 above and press SPEED
S T 5 0 plus T r i d a t a a n d R e p e a t e r O p e r a t i o n a n d I n s t a l l a t i o n H a n d b o o k Chapter 6 Calibration
27
Initial Calibration Notes
UIlik
Press RESET to toggle the depth units between feet and metres
Shallow Alarm
Use the TRIP or RESET keys to set the required shallow depth alarm
DeepAlarm
Press the TRIP or RESET keys to set the required deep alarm
NoteThe shallow and deep alarms are enabled by pressing the SPEED key
offset
The offset keel or waterline is set using the TRIP or RESET keys
Negative figure keel off set
Posiie figure waterline off set
0DEPTH
Countdown AlarmStatus
The countdown alarms can be turned on or off using the RESET key
El Alarm on enabled
UNITS
EO Alarm off disabled
Log Calibration
Refer to section 62 for complete details on setting log calibration
Exit Initial Calibration
To exit initial calibration and store the new settings press DEPTH and SPEED
together for 2 seconds
DEEP ALARM
OFFSET
S T 5 0 plus T r i d a t a a n d R e p e a t e r O p e r a t i o n a n d I n s t a l l a t i o n H a n d b o o k Chanter 6 Log Calibration
The ST50 Plus Tridata should not be used for navigational purposes until the
speed transducer paddlewheel has been calibrated to the vessel This is a
simple operation that can be carried out automatically over a measured
distance or by manually entering a calibration factor
Automatic Calibration
Automatic calibration should be carried out when tidal flow is at a minimum
Locate an easily identified marked and measured distance on a chart and
enter this distance into the instrument 4
NoteThe measured distance should ideally be between 1 and 25
NmMiles
Proceed from object 1 to object 2 measured distance pressing the SPEED
key at the start and finish of the run 5 and 6 The calibration factor is
calculated and displayed atthe end of each run 7
Repeat the run over the measured distance intfre opposite direction Once
QSPEED
again the calibration factor will be displayed This represents the average
for the two runs A further two runs can be made if required Dont forget
to store the log calibration factor
NoteThe log calibration range is from 025 to 200 Calibration factors
outside of this range cannot be stored
4
LOG DISTANCE
RUN START
RUN END
7 CALIBRATION
FACTOR
Note Once you have completed the runs store the calculated calibration
factor by pressing DEPTH and SPEED together until the displays returns to
normal mode 2 seconds
ST60 Pius Tridata and Repeater Operation and installation Handbook Chapter 6 following calculation must be used when carrying out Manual
Factor Known Distance
The Known distance is the distance between two charted objects eg Measured distance isthe distance recorded by the speed for tidal flow
COUNTDOWN ALARM
1 1 A p p r o x i m a t e l y 1Nm Of2 w9sl
To obtain the correction factor R proceed from object 1 to object 2 and then
object2 to object 1 The measured distance in each case must be noted
added together and then divided by 2 to obtain the average distance
To obtain the correction factor divide the known distance by the Once the correction factor has been calculated it can be entered into
the instrument as described in the flowchart on the following page Do not
forgetto store the correction log calibration range is from 025 to 200 Calibration of this range cannot be stored
NoteThe correction factor must be saved once it has been entered This is
achieved by pressing DEPTH and SPEED together until the display returns to
its normal mode 2 seconds
ST50 Plus Tridata and Repeater Operation and Installation Handbook Chapter 6
Intermediate Calibration Notes
Seletion
The ST50 Plus Tridata is factory set as a master unitnormally connected to
speed and ltcan however be set to repeat speed and
depth related information received via the SeaTalk bus
0 master mode
1 repeater mode
The following functions arenot available when set to repeater mode
l Log calibration
l Trip distance reset
l Average speed reset
Security Code
Full details on the CODE Lock security feature are given in Chapter 5
SOWARE
VERSION
SECURITY
1 J
l To exit intermediate calibration and store the new settings press SPEED
and TRIP for 2 Except for the countdown alarm status display initial calibration cannot
be accessed when the unit is configured as a Plus Tridata and Repeater Operation and Installation Handbook
Chapter 6 Extended Calibration Notes
All of the extended calibration screens are adjusted andor
RESET keys
Calibration
Calibration allows you to protect your selected settings against accidental
change When lock is enabled the initial and intermediate calibration settings
cannot be modd
Cl Calibration unlocked ie normal access
CO Calibration locked ie no access
Once locked calibration can be unlocked by entering extended calibration and
selecting calibration unlocked
Speed and Depth Damping
Damping adjusts the rate atwhichthese displays are updated The damping
range is 1 to 15 seconds default set at4 seconds
Depth damping is displayed as F and speed damping as A
caution
The Boat Show mode is a dealer demonstration program only Under
no circumstances mustihis program be engaged when Ihis unit is
installed onboard your vessel The display must therefore be left
settoOw
SPEED DAMPING
DEPTH DAMPING
0DEPTH
I NOT TO BE USED
FOR DbtER PURPOSES ONLY
0MPTH
ST50 Plus Tridata and Repeater Operation and Installation Handbook Chapter 7 Connection to other Marine
Chapter 7 Connection to other Marine Equipment
The ST50 Plus Tridata can only be connected to other SeaTalk products
However the ST50 PIusTridata Repeater can other
onboard marine electronic equipment using the NMEA0183 protocol
A lm 3ftl NM4 interface cable is supplied with every repeater unit The red
wire should be connected to the signal input Up to two NMEA0183
receivers may be connected to each repeater with NMEAoutput
RED Signal 2
BLUE Ground
The ST50 Plus Tridata Repeater has an NMEA0183 data output connector
The following information will be transmitted every 1 to 2 seconds if it is
available on the SeaTalk bus
Sentence Content Instrument Required
VWR Apparent Wind Speed Knots ST50 Plus Wind
direction
DBT Depth of Water below the ST50 Plus Depth or Tridata
Transducer Feet
HDM Magrxtic Heading ST50 Plus Steering Compass
HSC Locked Magnetic Heading SeaTalk Autopilot Lock
Model
VHW Water Speed KNots ST50 Plus Speed or Tridata
MTW Water Temperature 1DegC ST50 Plus Speed or Tridata
VTG Course Speed over Ground Navigation Receiver
GLL Latitude Longitude Navigation Receiver
BWC Bearing Distance to Navigation Receiver
8 General 8 General Dimensions Power supply lOtol6V
Power consumption 50ma normal lOOma illumination on
Temperature range Oto70degC
Speed through water 0 to 999 Kts
Trip distance 0 to 999 Nm
Log 0 to 99999 Nm
Average speed Oto999Kts
Maximum speed 0 to 999 Kts
Units Software programmable
Repeater capability Software programmable
Illumination 3 levels plus off
Manual log calibration 025 to 200 correction factor
Transducer speed range 08 to 40 Knots
Depth range Shallow alarm 3to33ftU tol0m
Deep alarm lOto4OOfU3to 120m
Minimum depth Reset on power up

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The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.