My watch is showing about 3x more distance than I actually swam but time etc is correct - why?
Why is my I watch showing the correct time etc. but about three times the distance so they actually swam in the open water
Apple Watch Series 2, watchOS 3
First, make sure you followed the steps in the "Update your height and weight" section of:
Adjust the workout settings on Apple Watch - Apple Support
or "Improve your Workout and Activity accuracy" section of:
Calibrating your Apple Watch for improved Workout and Activity accuracy - Apple Support
Also, see the "Get better results" section in:
Swim with your Apple Watch - Apple Support