Different wind sensors on DP vessels
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Dynamic Positioning: Wind Sensors
Wind sensors used in dynamical positioned vessels
  Wind Sensors At least one wind sensor must be enabled to provide the system with wind speed and direction information. Good practice is that all available wind sensors should be enabled allowing the system to monitor each wind sensor and flag a warning message or an alarm if it identifies a disparity outside of the accepted limits. The system will only use the input from one sensor and this sensor will be selected as preference by the DPO and will be the one most appropriate to the conditions and operation in hand.

A vessel should have its wind sensors placed in different locations and at different heights on board the vessel to make sure that at least one wind sensor is reading the correct wind speed at all times. If the wind direction changes, the DPO must set the system preferences so the best sensor is selected.

Definitions Relative wind is the speed and the relative direction from which the wind appears to blow, with reference to the movement of the vessel.

True wind is the speed and direction from which the wind is actually blowing. 
Loosely defined, relative or apparent wind is the wind we feel and experience when we are in motion. It's a combination of the actual wind (true wind) that blows over land and sea and the wind created by our moving forward. 

Because of this relationship between true wind and relative/apparent wind, and its speed and angle, we get such things as relative velocities and vector sums and the system needs to deal with these.

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Wind Sensors Used In DP