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Re: The Sailing gps
Interesting but I don't think it will be around long.
To the casual sailor, $400 is expensive. A $40 Android app could do the same thing without the need for hardware. Daylight-readable screens aside.
To the racer, having your own polars recorded and made available to a PC might be nice, if you don't already have them and if it does them well. But the tacking? Seems to have a lack of information. I'd tack based on obstructions (no way to input them) and wind variations (is it clocking? do I expect steady winds?) as well as what the fleet is up to. I don't see any explanation of how this gizmo plans tacks, or any user input for those factors. Also, every tack costs time and slows the boat. Again there's no factor for how to use the least number of tacks while still playing the laylines and obstructions and shifts.
Marvelous idea, but as soon as the $19.95 Android apps come out, his investment is toast. Sad to say.
If I just want to offset arrival time for tacking? Oh heck, multiply the straight line distance by 1.5 (1.4 being the diagonal of a square but more work) and you come close enough dead upwind. Cosines will do the work if you really want to finesse it.