Airmar LB150 User Manual
Page 25
LB150 WeatherStation Technical Manual revision 0.013
Proprietary and Confidential
PRELIMINARY - DRAFT
22
NMEA 0183 TRANSMITTED SENTENCE
$GP
VTG
Summary
NMEA 0183 standard Course Over Ground and Ground Speed.
Syntax
$GPVTG,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>*hh<CR><LF>
Fields
<1>
Course Over Ground, degrees True, to the nearest 0.1 degree
<2>
T = True
<3>
Course Over Ground, degrees Magnetic, to the nearest 0.1 degree
<4>
M = Magnetic
<5>
Speed Over Ground, knots, to the nearest 0.1 knot
<6>
N = Knots
<7>
Speed Over Ground, km/hr, to the nearest 0.1 km/hr
<8>
K = km/hr
<9>
Mode indicator:
A = Autonomous mode
D = Differential mode
E = Estimated (dead reckoning) mode
M = Manual input mode
S = Simulator mode
N = Data not valid
The only values transmitted by the LB150 WeatherStation for the
Mode indicator are A, D, and N.
Default State
Enabled. Transmitted once per second.
Notes
This sentence may be enabled or disabled via the $PAMTC,EN,VTG command.