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GPS100 User’s Manual
Page A2 Appendix A – NMEA 2000
®
Interfacing Revision 1.2
transmitted at a periodic rate of once per second (see PGN 126208 – NMEA Request Group
Function – Transmission Periodic Rate).
Field 1: SID – The sequence identifier field is used to tie related PGNs together. For
example, the GPS100 will transmit identical SIDs for 126992 (System Time), 128259
(Speed), 129026 (COG and SOG, Rapid Update), 129029 (GNSS Position Data),
129539 (GNSS DOPs), and 129540 (GNSS Satellitess in View) to indicate that the
readings are linked together (i.e., the data from each PGN was taken at the same
time although they are reported at slightly different times).
2: Speed Water Referenced – Since the GPS100 does not provide this data, this field
always reads as 0xFFFF (data not available).
3: Speed Ground Referenced – This field is used to indicate the speed over ground
(SOG) in resolution of 1x10
-2
m/s.
4: Reserved (24 bits) – This field is reserved by NMEA; therefore, this field always
contains a value of 0xFFFFFF (the GPS100 sets all reserved bits to a logic 1)
PGN 129025 – Position, Rapid Update
The GPS100 uses this PGN to provide latitude and longitude referenced to WGS84. The
factory default for periodic transmission rate is 10 times per second. The transmission of this
PGN can be disabled (see PGN 126208 – NMEA Request Group Function – Transmission
Periodic Rate).
Field 1: Latitude – Latitude in 1x10
-7
degrees ("-" = south, “+” = north)
2: Longitude – Longitude in 1x10
-7
degrees ("-" = west, “+” = east)
PGN 129026 – COG and SOG, Rapid Update
The GPS100 uses this PGN to provide Course Over Ground (COG) and Speed Over Ground
(SOG). The factory default for periodic transmission rate is four times per second. The
transmission of this PGN can be disabled (see PGN 126208 – NMEA Request Group Function
– Transmission Periodic Rate).
Field 1: SID – The sequence identifier field is used to tie related PGNs together. For
example, the GPS100 will transmit identical SIDs for 126992 (System Time), 128259
(Speed), 129026 (COG and SOG, Rapid Update), 129029 (GNSS Position Data),
129539 (GNSS DOPs), and 129540 (GNSS Satellites in View) to indicate that the
readings are linked together (i.e., the data from each PGN was taken at the same
time although they are reported at slightly different times).
2: COG Reference – This field is used to indicate the direction reference of the course
over ground. This field always reads as 0 (True, not magnetic).
3: Reserved (6 bits) – This field is reserved by NMEA; therefore, this field always
contains a value of 0x3F (the GPS100 sets all reserved bits to a logic 1)
4: Course Over Ground – This field is used to indicate the course over ground (COG)
in resolution of 1x10
-4
radians.
5: Speed Over Ground – This field is used to indicate the speed over ground (SOG) in
resolution of 1x10
-2
m/s.
6: Reserved (16 bits) – This field is reserved by NMEA; therefore, this field always
contains a value of 0xFFFF (the GPS100 sets all reserved bits to a logic 1)