Nmea 0183 Formats - Raytheon STD 21 GPS Operation Manual

4.4

NMEA 0183 Formats

• NMEA 0183 Format DTM
$- - - -DTM,ccc,a,x.x,a,x.x,a,x.x,ccc*hh<CR><LF>
Update rate 1 Hz
• NMEA 0183 Format HDT
$- - - -HDT,x.x,T*hh<CR><LF>
Update rate 1 Hz and Update rate 50 Hz
3717/110--850.DOC020002
DTM ⇒ Datum Reference
Local datum subdivision code
Local Datum code
HDT ⇒ Heading, True
Satellite Compass
STD 21 GPS
Reference datum code
Altitude offset, meters
Lon offset, minutes, E/W
Lat offset, minutes, N/S
WGS84 = W84
WGS72 = W72
SGS85 = S85
PE90 = P90
User defined = 999
IHO datum code
reading, degrees True
92
WGS84 = W84
WGS72 = W72
SGS85 = S85
PE90 = P90
Edition: Feb. 05, 2007