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  #1  
Old 08-27-2013
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Wind Vane Calibration

I've just installed a new Raymarine wind vane (E22078) which is connected to an ITC 5 converter and i70 display. It seems to read a bit high compared to other boats nearby. Does anyone know if there is a recommended calibration factor for this arrangement. As far as I can tell from some chatter I saw on the Raymarine web site it should work right out of the box without any calibration. Does anyone else have this setup and did you have to calibrate the system?
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Old 08-27-2013
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I took one apart to dry out some moisture and when I plugged it back in it read "calibrating" then seemed about right. Assumed it's auto.
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Old 08-28-2013
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Re: Wind Vane Calibration

Would that be wind speed or wind direction? Direction is easy, speed not sure how to calibrate. Would like to know.
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Old 08-28-2013
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Re: Wind Vane Calibration

The direction looks about right, the speed seems a bit high so it's the speed that may need calibration.
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Old 08-29-2013
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Re: Wind Vane Calibration

If there's a reference wind speed then its easy. Say if you trust a handheld anemometer, send someone with it up the mast with a walkie, let him tell you the wind speed so you could make offset on thee boat's wind instrument.
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Old 12-02-2013
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Re: Wind Vane Calibration

I have exactly the same setup (E22078, ITC-5, i70), and exactly the same problem.

I installed the system and according Raymarine it shouldn't need speed calibration. I did the direction calibration according to manual, and wind direction seems to be accurate.

However during my first real sail it lead me believe that I survived full gale of 34 knots with all my sails up.

Based on my seat of pants experience it is off by about 1/3 for wind speeds over 15kn.
What reads 24 seems to be 16, what reads 30 seems to be 20 and what reads 33 seems to be 22 etc.

So I set my 'Apparent wind speed' calibration constant to 0.67, and then wind speed seemed to match 'my experience' of sea state. At slower speeds it's harder for me to tell the difference.

Now, if I wanted just seat of the pants experience though, I wouldn't have paid $1200 for equipment, I would have just poked my head above the dodger and sniffed the air.

I'm yet to contact Raymarine support on this as I just returned yesterday.

But if anybody here has any reasonable suggestions (I don't own handheld anemometer that I trust either), please let us know.

ThirdCoastSailor, how much yours seems to be off?
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Old 12-02-2013
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Re: Wind Vane Calibration

I think you can do a crude check for accuracy, by taking two measurements :

1) Motoring directly into the wind

2) Motoring directly downwind

The two wind speeds measured should differ by 2x your motoring speed.

IE, you motor at 6 kts, readings of 20 kts and 8 kts indicate an accurate wind meter. (difference was 12 kts, 2 x motoring speed) (true wind was 14 kts)

If your meter is really reading 50% over without calibration, you should get 30 kts and 12 kts in the same scenario.

Edit : you need true wind that exceeds your motoring speed, to do this.

Edit edit : you also need no current, or at least known current.
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Old 12-03-2013
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Re: Wind Vane Calibration

Thanks MarkSF!

This seems a procedure that can be give me reasonably accurate way to calculate correction factor, if repeated over time and various wind and boat speeds and averaged up.

I think, if I use SOG from GPS for maintaining fixed boat speed then current should not matter.

Will give it a try next time out.

Martin
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Re: Wind Vane Calibration

I noticed that my B&G wind meter will display true wind, by subtracting the GPS velocity that it gets via NMEA 2000.

If it's accurate, it should read the same wind speed, in true wind mode, going either upwind or downwind.

In reality they differ by a knot or two. Good enough for me.
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Old 12-03-2013
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Re: Wind Vane Calibration

My Raymarine wind instrument (st60) will only give accurate true wind info when I have the paddle wheel for the knot meter in the water (not always the case). I was surprised it could not do it from the shared GPS info but apparently it can't.
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