The only non-standard NMEA string is the $WIMDA string for the RM Young Translator sensor. 

RM Young Translator sensor $WIMDA STRING field positions are:
1. Relative Wind speed.
2. Relative Wind direction.
3. Air Temperature.
4. Relative humidity in percent.

Ultrasonic anemometer sensor $WIMDA string field positions are:
1. Relative Wind direction.
2. Relative Wind speed.

The wind birds came loose from their mounting and rotated on several occasions during the field season. The anemometers were aligned at sea.