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decrepit said..
There's a difference in how the GW60 calculates the alpha separation, it uses doppler not trackpoints, so apart from the speed genie being set too high, or the distance being under 300m, there's a third reason why KA72 and other software can differ from the GW60 display.
Thanks for the explanation. I found the alpha on the watch rather useless. Last session, I got a 16.9 knot alpha with speed genie set above 20 knots - that should not be possible. Most sessions, the alpha readings I get are quite useless, even with low speed genie settings. That's very different from GPSLogit , which generally has quite accurate values, despite the phone GPS being less accurate.
I think the alpha algorithm in the watch could definitely be improved. But I wonder how many GW-60 owners actually look at the alpha, and how many get results that are close to what ka72, GPSResults, etc. are giving.