Join Date: Aug 2003
Location: Long Island, NY
Thanked 63 Times in 58 Posts
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Any racer will tell you that VMG is what it's all about. We use VMW all the time to determine how quickly we are moving TOWARDS WHERE WE WANT TO BE. If the mark is 1 mn away or 1000 nm away you want to maximize VMG. SEMIJim, the VMG information is helpful in determine WHEN to tack. If your VMG goes negative, you usually want to tack, because now you are sailing away from your destination.
When sailing downwind, VMG can be used to determine if you are better off sailing right down to the mark,. or 'heating it up' and sailing higher. With an Asymmetric, you sail faster when you sail higher, but if your VMG drops (even though your boats peed increases) you are not helping yourself.
Anyway, back to your original question, why not just get an Etrex? I have an old one that I bought back in 2004. I have all the race marks saved and I set up a screen with heading, bearing and distance to the mark, boat speed and VMG and estimated time to the mark. It's very helpful.
Deep Blue C, 2002 C&C 110
Mt. Sinai, NY
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