Maretron gps200 Manuale Utente

 

 

The GPS200 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 or the transmission rate of this PGN can be changed (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 GPS200 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 or the transmission rate of this PGN can be changed 
(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 GPS200 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 GPS200 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 GPS200 sets all reserved bits to a logic 1) 

 
 
 
PGN 129029 – GNSS Position Data 
The GPS200 uses this PGN to convey a comprehensive set of Global Navigation Satellite 
System (GNSS) parameters, including position information. The factory default for periodic 
transmission rate is once per second. The transmission of this PGN can be disabled or the 
transmission rate of this PGN can be changed (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 GPS200 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:  Position date –UTC Date in resolution of 1 day (The number of days since January 

1, 1970). 

 

3:  Position time – UTC Time in resolution of 1x10

-4

 s (24 hour clock, 0.0000 = 

midnight).