Airmar PB150 Technical Information download pdf (Page 22)

About True Wind Relative to Water

If a fix from a GPS receiver is not available, it is still possible for the

WeatherStation instrument to determine a value for true wind, if the speed of the

vessel through the water is known. In this case, it is necessary that a water-speed

sensor with an NMEA output (such as an Airmar Smart™ Sensor) be connected

to the NMEA input on the WeatherStation instrument (or to the optional

Combiner).

The WeatherStation instrument's calculation for true wind relative to water makes

the significant simplifying assumption that the vessel's course is the same as its

heading. That is, the effects of wind and current on the motion of the boat are

ignored. The direction of the true wind relative to water is referenced only to the

bow of the vessel, not to true or magnetic north.

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Airmar PB150 Technical Information Page 22