I have not seen this posted but I came across it when looking at new features present in the new 4.1 software for the 7520. Not sure if you need it or not to load the application, perhaps someone with the older .273 version of the software on their handheld can give it a shot and see if it works?
http://www.blackberry.com/maps
Go there on your BB and download it. It works with the internal GPS and is a pretty nice setup for free...
Also, the original thread where this info was posted by me is:
http://www.blackberryforums.com/rim-...tml#post419904