I’m using Steve McClelland's European scenery in the mission builder. The heading in free flight is 170.85.

I’ve added the runway to the aribases.dat. When I get into the mission builder, I find myself on the runway but my heading is 178.90, no matter what I put in the airbases.dat.

A minor thing and easily corrected with a little rudder but…why won’t it change?

The runway is Aldergrove, if that will help.

I should have included this before I posted;

[runway.124]
id=8051
name=Aldergrove
base_lat=N54 39.46
base_lon=W6 13.71
base_alt=271.35
heading=170.85
allegiance=0
units_across=1
takeoff_start_pos=-50,0
takeoff_stop_pos=1600,200
landing_start_pos=5000,350
landing_touchdown_pos=500,0
landing_stop_pos=-250,0

I seem to have the same off set with the other runways I've added.