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Ok, thanks. I haven’t experienced this issue with my Apple Watch. I will check next time but it seems to start when I hit start and the map etc seems accurate enough.
As Duncs says really - HR and GPS take a while to acquire but the watch pretends it has them from the off.
Click on "HR Accuracy" in the navigation for this review to go straight there: https://www.dcrainmaker.com/2017/11/apple-watch-series3-cellular-fitness-sport-review.html
With my Garmin 935 then you select run and the watch sits there for a moment acquiring a reliable GPS signal. It then tells you GPS is strong and you're good to start running.
If I just start running then I often get a couple of minutes of wobbly tracking at the start of the run while the GPS signal is sorting itself out.
Same with swimming. It struggles to get a lock when underwater so you'll always see everyone at the start of a race waving one arm around out of the water to get a decent signal before hitting start.
Apple watch seems to hide this bit from the user - so you may get a great signal right away (if you start in the middle of a field for example) or you might get a crap one (maybe if near a few tall buildings), but you wont know til you upload. And may be the start of the run has you zigzagging through buildings while it's figuring out where you actually were.