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post #1 of Old 11-27-2008 Thread Starter
SEMIJim
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True Wind Speed and Direction

The Admiral and I once thought we wanted a Raymarine ST60 wind speed and direction instrument. To me, though, such an instrument would be less useful than it could be without the ability to also yield true wind speed and direction. Talking to a fellow club-member a few days ago, he asserted the ST60 wind speed and direction instrument could do that. I just looked at Raymarine's site and, sure enough, it claims the instrument can do it. Curious: I downloaded the PDF of the user's manual. Yup: It says it does it. But here's the thing I don't get: Perhaps my mad math skillz are rusty, but ISTM that for the instrument to yield true wind speed and direction, it would have to know boat speed and heading. But the instructions for the device don't indicate having to hook up Seatalk connections to devices that will provide that. So how the heck can it calculate true wind speed and direction without knowing boat speed and heading?

Jim
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