I can't imagine needing a Nav system for driving around Toronto (I know the city pretty well and have a good map book in case I get turned around) but I do know that they're GREAT in rental cars in foreign cities. I used a GPS system in a rental car in LA one time and it really saved my hide. Now I don't need it much though since I've become quite familiar with the city.
overall I'm with MNB.. for most driving they're a bit frivilous -- give me a good map book and I'm ready to go. Maybe that's the outdoorsman in me coming out
