Ok, here's what I'm thinking: Measure the distance between two stationary marks with gps waypoints to gauge an accurate distance. Go out in good conditions and do several beam to broad reach runs using a stopwatch. Do the math, report back here. This sounds like a great way to kill time, no?
I'll report back my results as soon as we get an ideal day (and once the ice melts, of course).
It's still snowing here, so don't hold your breath.
Al