5.2 LD8 output sentences
5.2.10 RMC sentence
The NMEA RMC sentence provides essential GPS PVT (position, velocity, time) data.
RMC sentence structure & example
$GNRMC, hhmmss.ss, a, ddmm.mmmmmmm, b, dddmm.mmmmmmm, c, dd.ddd, eee.e, ddmmyy f.f, g, h *hh
$GNRMC, 143909, A, 5107.0020216, N, 11402.3294835, W, 0.036, 348.3, 210307, 0.0, E, D *31
RMC sentence defined
Field Content
RMC Recommended Minimum Sentence C
hhmmss.ss UTC time of position
a Position status (A = Active V = Void)
ddmm.mmmmmmm Latitude of position
b Latitude direction (N or S)
dddmm.mmmmmmm Longitude of position
c Longitude direction (E or W)
dd.ddd Speed over the ground, knots
eee.e Course over ground, degrees True
ddmmyy Current date
fff.f Magnetic variation, degrees
g
Magnetic variation direction E/W
Easterly variation (E) subtracts from True course.
Westerly variation (W) add to True course.
h
Mode indicator (A = Autonomous, D = Differential, E = Estimated (dead
reckoning), M = Manual input, N = Data not valid)
*hh Checksum
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LD8 Operations Manual
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