Now here's a weirder than weird one. When flying I use PHi map that shows plane travel, I use Skyvector map for actual route plotted, and FGMP for airport details. Now I was flying in Denmark happily looking at the scenery and was suddenly aware I was flying over open water on my sim screen. All three maps showed it was forest. I continued and eventually reached land. Then the terrain was as per the maps leading me to the airport.
Any ideas