I think AirNav support have missed an important point which several people have asked about in this thread. The map outline of any country is very simple, just as the SBS-1 was before it was redrawn in HD by Bones. His map outlines certainly work on RB for the UK, Belgium, France etc, but no-one seems to have succeeded in zapping the original simple coastline trace. It looks very untidy and offputting to have two coastlines that obviously do not co-incide where just a straight line may have been programmed to show a wiggly coastline! I did find a button to remove outlines, but it isn't selective, it is all or nothing! The SBS-1 coastlines appear in an individually named file in the .out folder and all that is required is to reduce the original file to 0 bytes, the old trace then went away. The UK file in the RB .out file seems to be just a snapshot of a saved area of the UK, take it out, but nothing happens apart from the loss of that saved area. The simple coastline trace pops up again to haunt you!
Peter