Veripos HEXAGON LD8 - Page 38

Reference information
LD8 Operations Manual 38
RMC sentences
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
HDT sentences
The NMEA HDT sentence provides heading information derived from the receiver.
HDT sentence structure & example
$GNHDT,
dd.dddd,
T
hh
$GNHDT,
75.5664,
T
*36
HDT sentence defined
Field
Content
HDT
Heading (true) message
dd.dddd
Heading in degrees
T
Degrees True
*hh
Checksum