Summary
NMEA 0183 standard Meteorological Composite.

Syntax
$WIMDA,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>,<13>,<14>,<15>,<16>,
              <17>,<18>,<19>,<20>*hh<CR><LF>

Fields
<1>    Barometric pressure, inches of mercury, to the nearest 0.01 inch
<2>    I = inches of mercury
<3>    Barometric pressure, bars, to the nearest .001 bar
<4>    B = bars
<5>    Air temperature, degrees C, to the nearest 0.1 degree C
<6>    C = degrees C
<7>    Water temperature, degrees C (this field left blank by WeatherStation)
<8>    C = degrees C (this field left blank by WeatherStation)
<9>    Relative humidity, percent, to the nearest 0.1 percent
<10>   Absolute humidity, percent (this field left blank by WeatherStation)
<11>   Dew point, degrees C, to the nearest 0.1 degree C
<12>   C = degrees C
<13>   Wind direction, degrees True, to the nearest 0.1 degree
<14>   T = true
<15>   Wind direction, degrees Magnetic, to the nearest 0.1 degree
<16>   M = magnetic
<17>   Wind speed, knots, to the nearest 0.1 knot
<18>   N = knots
<19>   Wind speed, meters per second, to the nearest 0.1 m/s
<20>   M = meters per second




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