NMEA MWD datagram
The NMEA MWD datagram provides the direction from which the wind blows across the earth's surface. The wind direction is related to north. The datagram also offers the wind speed.
Format
$--MWD,x.x,T,y.y,M,z.z,N,s.s,M*hh<CR><LF>
Description
1 $—Talker identifier
2 MWDDatagram identifier
3 x.x,TWind direction, true (0 to 359°)
4 y.y,MWind direction, magnetic (0 to 359°
5 z.z,NWind speed in knots
6 s.s,MWind speed in meters/second
7 *hhChecksum