Hello
Starting from a situation where my Forerunner 15 is set up in métric units. If I set up the autolap functionality to be active, then I get 1 km circuit in the courses, when they are displayed on the watch and uploaded in GC.
If, before a sync, I change the autolap functionality in GC to activate it, then, on the next course, the circuits are 1 mile circuit, instead of 1 km circuit. If I disactivate the autolap on the watch and then re-activate it, it gets back on 1 km circuit.
So, it seems that GC configuration via sync is not correct for this particular functionality of Forerunner 15.