When I play Golf with activity tracking enabled, the odometer is accurate until I end the activity.
As soon as I end the activity, the total distance becomes shortend by approximately 10%
If at the time of ending my activity, the total distance was 5.3KM, then the saved activity which also appears on connect as well as the activity history on the watch will be approximately 4.8KM
My watch distance units are in Kilometers and Golf units are in yards.
The difference in saved distance is similar in ratio to the ratio between meters and yards.
