Finding your way with your iPhone just got better: TomTom has launched its GPS navigation app for the iPhone today.

The app costs $100, so it's not a capricious download, but it is from a respected name in GPS devices, TomTom, and features turn-by-turn directions.

It's probably a boon for those in the market for a dashboard GPS device for their car, since the price is pretty comparable to a separate device (sans a dock or charger, of course).