Information on the pilot has came out and he was a very experienced local flyer. I know the weather north of the area was blue sky Cav OK. They probably picked up the Autobahn as a guide. It has also been reported they hit trees before the power pole.
I use GPS a lot in China for getting around on foot in the humidity it jumps around like crazy when I track my route later, the power lines in the fog would be just the same level of spark interference.
Anyway apart from an engine problem turn off the wrong one error, it is a do not even go there situation we read time and time again.