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GNSS Compass Reference Manual • Using GNSS Compass
PGN Description
126992 System Time
UTC time and date
126993 Heartbeat
Transmitted by all NMEA devices to indicate the device is still
present on the network. Reception of this PGN may also be used
to maintain an address to NAME association table within the
receiving device.
127250 Vessel Heading
True and magnetic heading
127251 Rate of Turn
Rate of change of the heading
127252 Heave
Vertical distance relative to the average sea level
127257 Attitude
Orientation of the vessel
129025 Position, Rapid Update
Rapid update of latitude and longitude
129026 COG & SOG, Rapid Update
Rapid update of Course Over Ground (COG) and Speed Over
Ground (SOG)
129029 GNSS Position Data
Position and GNSS fix status
129540 GNSS Satellites in View
130578 Vessel Speed Components
Longitudinal and transverse speed
Table 18: NMEA 2000 transmitted messages
7.6 NMEA 0183
The GNSS Compass supports outputting the version 4.10 compliant NMEA 0183 messages over both Serial
and Ethernet connections.
For the serial variant (GC2-SER):
Serial data is output on the Auxiliary serial port.
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Each message can be enabled or disabled and output rates are configurable.
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For the Ethernet variant (GC2-POE):
v2.0 Page 32
Output Period Rate
(milliseconds) (Hz)
1000 1
60000
100 10
100 10
100 10
1000 1
100 10
250 4
1000 1
1000 1
250 4
04 Nov 2021