Well, as most people know the milestone (droid overseas from the us) did not come with google navigation. Well, it didn't take long for a hack to come out to make it available.
Google usually turns it's head to things like this. They just kind of let android go. Like with rooting. But this time, they got even. They disabled the gps hack.
Google Maps Navigation hack for non-U.S. use no longer works | Google Android Blog
Lets hope this doesn't mean they will feverishly work to patch the rooting of the droid. This may have been due to legal ramifications. But who knows....