I use GSPro indoors only and setting the altitude and the boost in GSpro it gets very close to real distances. Also find that short flop shots work well on short shots around the green. The R10 seems to have problems with low shots even with full shots…

As an example, at a latitude of 40 degrees (north or south) the Pythagorean formula will give distances roughly 30% too large when measuring distance in an east/west direction.

Perhaps related to this are discussions about Fenix 6X measuring the distance short on a difficult terrain, up to 5-10% short. Let me explain that. I think, fundamentally, algorithm is the same between the Ultratrac and the normal every second mode. Even…

I recently upgraded from the VA HR to the VA3.(Christmas special, 2019)
I was very surprised and disappointed that the VA3 consistently returned the same 4-5% short distances compared to my VA HR which had always been spot on (compared to published race…

My 6X has consistently been a bit short. Approximately.1-.2 miles short every 10 miles (comparing to everyone else’s watches). I’m finding 16.7 actually appear to have corrected it for me. 

They are different issues, I've experienced both. The pool issue is where it just measures 0 distance for the swim. The open water one is weird, the distance comes up very short compared to my old 735xt. If I export the gpx and upload to a gpx reader…

I had the S40 approach, and that was totally in sync with my club distance, after I got the S60, I am always short of where I want to be, but the garmin golf app suggests the club distance is accurate. Obviously thr watch is not giving me the right distance…