Shouldn't the GPS take into consideration user-dependant "bad areas"? Let me give a few examples:

- You are wearing a red shirt with a red bandana. Should the GPS warn you away from Crips territories?

- You are the paragon of the mindless MTV generation, and you worship Paris Hilton. Should the GPS warn you against clubs frequented by Goths, who might hurl insults at you? Though vacuous that you are, you may still feel the sting of words!

These are, I hope my readers realize, tongue in cheek. The more "serious" (if the term applies) scenarios may include areas with a history of intolerance of various sorts (race, sexual orientation, creed, etc.).