Hi there,

even if myself did not encouter severe issues within Germany yet there are some very bad vibrations on SD chart accuracy especially in Italian and German charts. Compared to physical ones there is a deviation between for example location of CTRs/ED-Rs/VFR routes and so on thus you cannot rely on that.
You can find more detailed info in a German forum of the very well known magazine "Pilot und Flugzeug" unfortunately only in German language:
https://www.pilotundflugzeug.de/forum/2014,01,31,21,3039439

It is worth reading it because many German pilots are building their opinion upon that and the most important thing of a moving map is accuracy in charts. I think articles like this one prevent thousands of potential users subscribing to SD. Therefore please focus on accuracy instead of features as the tool from that perspective is leading egde so far...

Having that said I will always compare my tracks against physical charts and will report any inconsistence.

Cheers,
joseffe

Naïve detail reduction on polygons and polylines cannot be used on OSM road data to make it useful. We already use such algorithms on the data we have. The biggest problem with using OSM data is that roads with a median are represented as more than one polyline, and merging these is a very nontrivial task. Also, we found the railway data to be very unreliable. Thanks for the offer though.