I have just done a test. I can open all the menus, change settings, zoom in and out etc.
If I open the Blackberry Maps application and stand in my garden I can see that the GPS grabs up to 10 satellites. If I then move around the north arrow changes accordingly and the miles per hour indicates my speed. I have also waited about 10 minutes for the maps to update/load but to no effect. Everything appears to be working except the map display as it is still just diagonal lines.
If I open Google maps then I get the appropriate map loaded within a couple of seconds and can also see myself moving about in the form of a blue flashing dot. I can work out routes and zoom in and out and change to satellite views etc
The Blackberry maps has never worked since I got the blackberry.