I run three times a week and "calibrate and save" after each run as the distance data is all over over the place. My problem is that the 945 don't seem to learn from the calibration.
I had several other Garmin watches and calibration always worked fine and after 4-5 calibrations the distance would be pretty close to the distance reported by the treadmill.
The 945 isn't even close. On a 8-10km run it can be off with 4-5km!! And that is after many earlier calibrations done on same treadmill.
When it's off that much you can't use calibrate and save either because it seems like there is a limit to how much up/down you can go from the 945's measured distance. F.ex. if the 945 say I ran 3km and the treadmill 8km, I can only Calibrate and save max 6km or something
I have had several updates and also done a couple of factory resets.