Here is what happens:
1. load a .gpx route onto to the device (e.g. via Strava or RideWithGPS)
2. Select it in "Courses" and choose Ride
3. Starts recording ride
4. When done, the .fit file is huge (20-30Mb)
This is reproducible. Am I doing something silly?
I enclose the latest file but I can't keep pinging aweatherall to fix the .fit file after every ride...