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Old 12-03-2013
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Re: Wind Vane Calibration

I think true wind calculations shown by instruments are usually done based on speed through water rather than GPS speed over ground, because wind speed over water in relation to your keel is what moves your sailboat.

However, for apparent wind speed calibration calculations it seems easier to get current out of the equation and pretend that I am driving a car with mast over seabed with GPS giving the speed over ground. It would be similar to taking off the wind transducer and mounting it on top of my van. (probably too much trouble to do in reality) and doing the test this way.

I'm hoping the once the apparent wind is properly calibrated the true wind speed calculations will take care of them selves over water with current included.

Maybe I am over thinking it.
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Old 12-05-2013
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Re: Wind Vane Calibration


I'm guessing my unit is reading high by about 20%. It reads 30 knots in what I think is about 25 knots.


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Old 12-05-2013
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Re: Wind Vane Calibration

Ours is out too, reads a little high maybe 10-15%. No big deal as it is the only wind speed indicator onboard. It's an older Datamarine unit and it has no calibration adjustment.
It is what it is, so you become accustom to it. Fifteen knots of wind is a relative reading that you take as is. What the actual wind speed is doesn't really matter so long as you know your boat and instruments accordingly.
We have three rules;
No screaming.
No bleeding on the sails.
No slobbering on the charts.
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