Direction of arrow is wrong while using a map that's not "North up"

[GoogleCodeExporter]

What steps will reproduce the problem?
1. I use several maps (or aerial photographies) which are not "North up" but 
turned in different angles, all calibrated with Ozi.
2. My position (even when moving) is shown correctly, but the heading of the 
arrow is wrong.  With all maps it behaves like North was "up": e.g. when I'm 
going westwards it shows to the left, even when the map has west somewhere on 
the bottom of the screen. (Ozi does not have this issue.)

What is expected? What do you get instead?
Map calibration file should be used to find out, whether the map is "turned".

What version of the product are you using?
1.7.6

Original issue reported on code.google.com by feldmann...@gmail.com on 20 Dec 2013 at 7:07