Garmin GPSMAP 902 Series Owner's Manual page 55

• Ensure the device is using the latest software. If not, update
the device software (Software Update, page
• Make sure the device has a clear view of the sky so the
antenna can receive the GPS signal. If it is mounted inside of
a cabin, it should be close to a window so it can receive the
GPS signal.
• If the device is using an external GPS antenna, make sure
the antenna is connected to the chartplotter or the NMEA
network.
• If the device has more than one GPS antenna source, select
a different source (Selecting the GPS Source, page
My device will not turn on or keeps turning off
Devices erratically turning off or not turning on could indicate an
issue with the power supplied to the device. Check these items
to attempt to troubleshoot the cause of the power issue.
• Make sure the power source is generating power.
You can check this several ways. For example, you can
check whether other devices powered by the source are
functioning.
• Check the fuse in the power cable.
The fuse should be located in a holder that is part of the red
wire of the power cable. Check that the proper size fuse is
installed. Refer to the label on the cable or the installation
instructions for the exact fuse size needed. Check the fuse to
make sure there is still a connection inside of the fuse. You
can test the fuse using a multimeter. If the fuse is good, the
multimeter reads 0 ohm.
• Check to make sure the device is receiving is at least 10 V,
but 12 V is recommended.
To check the voltage, measure the female power and ground
sockets of the power cable for DC voltage. If the voltage is
less than 10 V, the device will not turn on.
• If the device is receiving enough power but does not turn on,
contact Garmin product support at www.garmin.com/support.
My device is not creating waypoints in the correct
location
You can manually enter a waypoint location to transfer and
share data from one device to the next. If you have manually
entered a waypoint using coordinates, and the location of the
point does not appear where the point should be, the map
datum and position format of the device may not match the map
datum and position format originally used to mark the waypoint.
Position format is the way in which the GPS receiver's position
appears on the screen. This is commonly displayed as latitude/
longitude in degrees and minutes, with options for degrees,
minutes and second, degrees only, or one of several grid
formats.
Map datum is a math model which depicts a part of the surface
of the earth. Latitude and longitude lines on a paper map are
referenced to a specific map datum.
1
Find out which map datum and position format was used
when the original waypoint was created.
If the original waypoint was taken from a map, there should
be a legend on the map that lists the map datum and position
format used to create that map. Most often this is found near
the map key.
2
Select Settings > Preferences > Units.
3
Select the correct map datum and position format settings.
4
Create the waypoint again.
Contacting Garmin Product Support
• Go to www.garmin.com/support
information.
• In the USA, call 913-397-8200 or 1-800-800-1020.
Appendix
2).
2).
for in-country support
• In the UK, call 0808 238 0000.
• In Europe, call +44 (0) 870 850 1241.
NMEA 2000 PGN Information
Type PGN
Transmit and receive 059392 ISO acknowledgment
059904 ISO request
060928 ISO address claim
126208 NMEA: Command, request, and
126464 Transmit and receive PGN list group
126996 Product information
127250 Vessel heading
128259 Speed: Water referenced
128267 Water depth
129025 Position: Rapid update
129026 COG and SOG: Rapid update
129029 GNSS position data
129540 GNSS satellites in view
130306 Wind data
130312 Temperature
Transmit 127258 Magnetic variance
129283 Cross track error
129284 Navigation data
129285 Navigation route and waypoint info
Receive 065030 Generator average basic AC quantities
126992 System time
127488 Engine parameters: Rapid update
127489 Engine parameters: Dynamic
127493 Transmission parameters: Dynamic
127504 AC output status
127505 Fluid level
127508 Battery status
129038 AIS class A position report
129039 AIS class B position report
129040 AIS class B extended position report
129539 GNSS DOPs
129794 AIS class A static and voyage related
129809 AIS class B "CS" static data report, part
129810 AIS class B "CS" static data report, part
130310 Environmental parameters
130311 Environmental parameters (obsolete)
130313 Humidity
130314 Actual pressure
NMEA 0183 Information
Type Sentence
Transmit GPAPB
GPBOD
GPBWC
GPGGA
Description
acknowledge group function
function
(GAAC)
data
A
B
Description
APB: Heading or track controller
(autopilot) sentence "B"
BOD: Bearing (origin to
destination)
BWC: Bearing and distance to
waypoint
GGA: Global positioning system
fix data
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