No worry, didn’t get the impression you where grumpy :) During my lunch break today I made a quick export of some building geometry that been produced with an RTK. After a bit of tweaking I got it into the webtool as an GPX. If I remember correctly the Bing map needen an offset of -0,8;-18,5 to align with “the real world”. With that, most of the buildings and roads in the eastern part of town aligned quite nicely. But depening on the zoom level the offset grew further west. Saw a couple of places where the NVDB data is way off. Gonna have a look at that too. In your opinion, is it better to have the Open Street Map geometry (like buildings), align to the aerial photo or too their correct coordinates?      