GNSS Compass Reference Manual
Page 39 of 85
Version 1.1
13/01/2021
9.4
NMEA 2000
The GNSS Compass permanently outputs the NMEA 2000 messages listed in Table 22 below.
PGN
Description
Output Period
(milliseconds)
Rate (Hz)
126992 System Time
UTC time and date
1000
1
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.
60000
127250 Vessel Heading
True and magnetic heading
100
10
127251 Rate of Turn
Rate of change of the heading
100
10
127252 Heave
Vertical distance relative to the average sea level
100
10
127257 Attitude
Orientation of the vessel
1000
1
129025 Position, Rapid Update
Rapid update of latitude and longitude
100
10
129026 COG & SOG, Rapid Update
Rapid update of Course Over Ground (COG) and
Speed Over Ground (SOG)
250
4
129029 GNSS Position Data
Position and GNSS fix status
1000
1
129540 GNSS Satellites in View
1000
1
130578 Vessel Speed Components
Longitudinal and transverse speed
250
4
Table 22: NMEA 2000 transmitted messages
9.5
NMEA 0183
The GNSS Compass supports outputting the version 4.10 compliant NMEA 0183 messages over
both Serial and Ethernet connections.
Serial data is output on the Secondary serial port. Each message can be enabled or disabled and
output rates are configurable.
Ethernet messages are enabled by default, however can be selectively disabled. The minimum
rate is 1 Hz, except for GPHBT & TSS1 whereby the minimum is as indicated in Table 11. NMEA
0183 broadcast packets are sent via multicast to IP address 239.192.0.4. These are sent
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