Does Gps on the Cell phone/iPhone work as well as typical car GPS systems (i.e; Garmin and Tom Tom)?

Just curious how well the GPS systems work on Cell phones, and on the new iPhone as i was very close in getting the iPhone because of the GPS, but finished up buying a Garmin Nuvi instead.

But may get the iPhone down the road, and sell the Garmin – which works awesome and i like it. But if i can get the same via iPhone (plus the other bells and whistles) or Cell buzz then i might do that instead.

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