Got my Watch 3 Pro today and took it for a test this afternoon. I walked a 1.6km route ( 800m each way) which I run with my granddaughter. The halfway point on the Watch 3 was 400m further than where the Watch Pro 1 showed it to be. But at the finish point, the Watch Pro 1 would only show 1.45-50 km , but the Watch 3 was spot on at 1.6km. So what are your thoughts or experiences with the distance accuracy?