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D Logs summary
150 MiLLennium Command Descriptions Manual
GPRMC GPS Specific Information
Time, date, position, track made good and speed data provided by the GPS navigation receiver. RMC and RMB are
the recommended minimum navigation data to be provided by a
GPS receiver. This log will output all null data
fields until the GPSCard has achieved first fix.
Structure:
Example:
$GPRMC,220216.50,A,5106.7187663,N,11402.3581636,W,0.3886308,130.632,150792,
0.000,E*4B[CR][LF]
➀ Easterly variation (E) subtracts from True course
Westerly variation (W) adds to True course
➁ Note that this field is the actual magnetic variation East or West and is the inverse sign of the value entered
into the
MAGVAR command. See MAGVAR in Appendix C for more information.
lat dir
$GPRMC utc pos status lat lat dir
lon lon dir speed Kn track true date
mag var var dir *xx [CR][LF]
Field Structure Field Description Symbol Example
1 $GPRMC Log header $GPRMC
2 utc UTC of position hhmmss.ss 220216.50
3 pos status Position status: A = data valid
V = data invalid
A A
4 lat Latitude (DDmm.mm) llll.ll 5106.7187663
5 lat dir Latitude direction (N = North, S = South) a N
6 lon Longitude (DDDmm.mm) yyyyy.yy 11402.3581636
7 lon dir Longitude direction (E = East, W = West) a W
8 speed Kn Speed over ground, knots x.x 0.3886308
9 track true Track made good, degrees True x.x 130.632
10 date Date: dd/mm/yy xxxxxx 150792
11 mag var
Magnetic variation, degrees
➀
x.x 0.000
12 var dir Magnetic variation direction E/W➁ a E
13 *xx Checksum *hh *4B
14 [CR][LF] Sentence terminator [CR][LF]