“TomTom for the iPhone”, the GPS app for the iPhone, is out and being sold at $99, one of the most expensive apps released by Apple. Already touted to replace GPS devices, TomTom for the iPhone contains maps for the United States and Canada.

Other features of TomTom for the iPhone include: voice-enabled turn-by-turn directions, “Tap and Go”, one-touch navigation for contacts in the address book of your iPhone, an establishment finder for restaurants, gas stations, and the like, and “IQ Routes” which determine the most efficient route based on historical data from a million other drivers and actual data on road speed.

Though there have existed other GPS programs on Apple’s App Store, TomTom for the iPhone has already reached the number two spot as the most popular GPS application that Apple has to offer. It is the only GPS application with hardware support, from a car windshield mount, a speaker, GPS booster, to its own charger.

Sooner or later, developers and consumers alike expect TomTom for the iPhone to release updates that will fix minor glitches – and to replace the typical standalone GPS.