heading adjustment ... when does it stop?

[rastam4n]

rastam4n
try the compass mode instead of the gps. as shown in your linked photo.
i don't think you can calibrate the gps heading..

Thanks Jim
I actually typically use compass mode, and do have to adjust the offset each time I go out... but this particular instance I had adjusted the offset that day already in compass mode and it was working good, then when I activated the route and py.pilot switched to gps mode and instantly the offset was incorrect again. 
I need to do some tests switching from gps to compass... but this may be a secondary bug? 

Primarily in compass mode I am having to adjust the heading offset at least once each time I go out, and I have had to adjust it each time I make a major heading change. 

Does the moitessier hat need to be mounted horizontally? I currently have it mounted on its side.