Was trying for alphas the other day in lightish winds, couldn't get the watch to read over 22.5, I felt I had done better than that. I was pleasantly surprised to see a 23.415 from the GW52 once I crunched the numbers, so did a bit of investigating and found the GW52 alpha had a separation of 49m it disappears at 48m. Whereas the watch has the same alpha with a 52m separation. So there's a 3m difference between the two.

I had the GW52 on my head and the watch in the middle of my inner forearm with display inverted.

The GW52 is the left one at 50m the right one is the watch at 52m
There's not much difference between them, the SDoPs are very similar. the watch has one very brief sat drop out and the doppler and positional tracks aren't quite as well aligned. But 3m different in separation, this could cost you a PB!
It's very tempting to aim for 45m just to be sure the alpha is legal.

I checked the rest of my alphas, and it's not consistent, some are identical, so it's a random variation as well.
Any thoughts?