This is not really a question so I'm not sure what you mean but I'll try to answer anyway. The Map Coverage page uses corrected coordinates if you have entered them. This is, however, with the same caveat at any other use of corrected coordinates at Project-GC.
There are two ways to correct coordinates on PGC:
- Adding the correct coordinate in the Personal Cache Note field on the cache page.
- Adding the correct coordinate in the Corrected Coordinates field on the cache page.
Using the Personal Cache Note field will always work. The first coordinate (if there are several) from that field will be used.
Using the Corrected Coordinates field may also work, but the Groundspeak API (which is the interface we use to fetch data from geocaching.com) puts hurdles in the way here. There is no API function to fetch all caches that a user has corrected in this way, and there is no API function to find out which caches a user has corrected in this way to fetch only those. The effect of that is that in order to fetch all corrected coordinates for all users, we would need to fetch all caches in the world as all users. This is obviously not practical. Another problem with this method is that Groundspeak only allows you to correct the coordinates for Mysterys and Multis. If you want to correct a Letterbox or for that matter a Traditional where the coordinates are reported to be off, you are out of luck with this method and need to use the Personal Cache Note instead.