Satellite Compass
STD 21 GPS
Edition: Feb. 05, 2007
3717/110--850.DOC020002
92
4.4
NMEA 0183 Formats
•
NMEA 0183 Format DTM
DTM
⇒
Datum Reference
$----DTM,ccc,a,x.x,a,x.x,a,x.x,ccc*hh<CR><LF>
Reference datum code
WGS84 = W84
WGS72 = W72
SGS85 = S85
PE90
= P90
Altitude offset, meters
Lon offset, minutes, E/W
Lat offset, minutes, N/S
Local datum subdivision code
Local Datum code
WGS84 = W84
WGS72 = W72
SGS85 = S85
PE90
= P90
User defined = 999
IHO datum code
Update rate 1 Hz
•
NMEA 0183 Format HDT
HDT
⇒
Heading, True
$----HDT,x.x,T*hh<CR><LF>
reading, degrees True
Update rate 1 Hz and Update rate 50 Hz
Содержание STD 21 GPS
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