Veripos LD8 - GLL Sentence; VTG Sentence

Reference Information
LD8 Operations Manual AB-V-MA-00635_RevA2 31
5.2.7 GLL SENTENCE
The NMEA GGL sentence provides Latitude and Longitude position data for the present position.
GLL SENTENCE STRUCTURE & EXAMPLE
$GNGLL,
ddmm.mmmmmmm,
a,
dddmm.mmmmmmm,
b,
hhmmss.ss,
S,
I
*hh
$GNGLL,
5708.7104685,
N,
00217.1169613,
W,
062859.00,
A,
D
*72
GLL SENTENCE DEFINED
GLL
Geographic position - Latitude and Longitude
ddmm.mmmmmmm
Latitude of position
a
Latitude direction (N or S)
dddmm.mmmmmmm
Longitude of position
b
Longitude direction (E or W)
hhmmss.ss
UTC time of position
S
Status (A = data valid ; V = data not valid)
I
Positioning mode indicator (A = Autonomous, D = Differential,
E = Estimated (Dead reckoning), M = Manual, N = Data not valid)
*hh
Checksum
5.2.8 VTG SENTENCE
The NMEA VTG sentence provides the actual course and speed relative to the ground.
VTG SENTENCE STRUCTURE & EXAMPLE
$GNVTG,
ppp.ppp,
T,
qqq.qgg,
M,
rr.rrr,
N,
ss.sss,
K,
U,
*hh
$GNVTG,
167.608,
T,
167.608,
M,
0.006,
N,
0.012,
K,
D,
*3D
VTG SENTENCE DEFINED
VTG
Course over ground and ground speed
ppp.ppp
True course over ground
T
Degrees True indicator
qqq.qgg
Magnetic course over ground
M
Degrees Magnetic
rr.rrr
Speed over ground, knots
N
Nautical speed indicatior (N = Knots)
ss.sss
Speed over ground, kilometres/hour
K
Speed indicator (K = km/hr)
U
Positioning mode indicator (A = Autonomous, D = Differential,
E = Estimated (Dead reckoning), M = Manual, N = Data not valid)
*hh
Checksum