Paper map, Maemo Mapper and Maps place me at about N50.097 E8.666 - Roadmap has me at N50.083333, E8.650000.

Given that the location would be about N50°05'50" E8°40'00" in DMS and is given as about N50°04'58" E8°39'00", it rather looks as if there was a one-minute-off problem in either direction - an error of that magnitude is way above GPS drift.