sailquik said..>>>>>
In any case, if you want to see a realistic 2 second speed on your GW-60 on the water, just set the average speed readout to 2 seconds (I think maybe most sailors set it to 10 seconds?) and
ignore the Max speed reading.

Andrew, how often do you use the watch? Have you got the latest firmware???
We went to great trouble with locosys, to get 3 separate speed readouts. max speed (which is irrelevant,) Ns and Ms. On my watch I don't display max speed, I display 2s average and 10s average.
Ns is used to calculate the 5X average, so set that to 10s and set Ms to 2s, and as Andrew says , turn max speed off.
That way you see both your 2s average and your 10s average.
Sue I don't use KA72, but I'd be extremely surprised, if it shows more than a small fraction of a knot difference.
And Carindale, the watch calculates alphas a bit differently to all the other software. The watch doesn't display some alphas that other software gives and vise versa. There are two differences, the watch uses doppler data to calculate the 50m separation the others use trackpoints, (we have a disagreement among experts here as to which is better). And the watch hasn't got the processing power to calculate all alpha possibilities, so it's limited to those over 300m total length. Any alphas under 300m aren't going to be super fast, but other software goes shorter. I think KA72 gives 100m alphas and over. Realspeed will give an alpha of any length as long as there is the required change of direction.
As to preferred posting option, if the GT31 is worn in an optimum position, it's very accurate, but if on the arm it can slip down under the arm. This is far from optimum!
The watch on the other hand, has the under over grip thing, but it seems to cope with that better than we expected. So If you have problems maintaining the GT31 on top of you arm, the watch probably will have a more consistent accuracy, as it's 5hz, it will also be able to pick the best part of a 2s peak, so you won't miss out on your best speed.