I’ve never been able to get my GPS V1 to show a difference between gps.headingVehicle and gps.headingMotion. Here’s a scatter plot from a lap of the Nordschliefe, I wouldn’t expect this to be a straight line.
To view the settings, select the GPS device by double-clicking on it.
Currently, the ADU is selected.
(An arrow on the left side of the device list points to the selected device.)