If you put the solved coordinates in the "Personal Cache Note" field of the cache page, Project-GC will read them from there and after that display the cache on the corrected coordinates instead of the posted coordinates (unless you specify otherwise). You can then show only caches with corrected coordinates with the Solved Mysteries page, but they will also appear on the correct places on Map Compare, for instance (together with any other caches that happen to be in the same area).