Airmar LB150 User Manual
Page 20
LB150 WeatherStation Technical Manual revision 0.013
Proprietary and Confidential
PRELIMINARY - DRAFT
17
NMEA 0183 TRANSMITTED SENTENCE
$WI
MWD
Summary
NMEA 0183 standard Wind Direction and Speed, with respect to north.
Syntax
$WIMWD,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>*hh
Fields
<1>
Wind direction, 0.0 to 359.9 degrees True, to the nearest 0.1 degree
<2>
T = True
<3>
Wind direction, 0.0 to 359.9 degrees Magnetic, to the nearest 0.1
degree
<4>
M = Magnetic
<5>
Wind speed, knots, to the nearest 0.1 knot.
<6>
N = Knots
<7>
Wind speed, meters/second, to the nearest 0.1 m/s.
<8>
M = Meters/second
Default State
Disabled. Transmitted once per second when enabled.
Notes
The wind speed and direction data provided in this sentence are calculated using
vector math based on the measured apparent wind speed and direction, SOG and
COG from the GPS, compass heading, and magnetic variation. If any of these
data are not available, this sentence shall be transmitted with null fields.
This sentence may be enabled or disabled via the $PAMTC,EN,MWD command.