Thx for your helpful answers
I recently found the edit-function and am using it now rly often The point about how to get the corrected coords shown on the overview-map was new to me - good to know.
The problem with the app DEMPtalked about, is also annoying me a lot. Furthermore I'd like to hide the caches I alrdy have found (in the app). Is there an option in c:geo or the official app?
Thx for your many replies.