The REMOVE function in the Maps application -> Maps (management) command does not work when you only have one map.

This can be a real problem in that you will always have to have at least one map (taking up a LOT of space I might add and I don't have enough memory cards yet!).

It looks like the only way at present to get rid of that last map is to delete the application altogether.

Another way is to install a SMALLER map, and then it will let you delete the bigger one.

Or go into the file manager, find the internal card, and theres a maps folder. Inside that is a folder for each map you've downloaded.