TechReviewSource.com posted a review on the Magellan RoadMate iPhone App
The Magellan RoadMate iPhone application is a full-featured GPS navigation software that transforms your iPhone into a handheld GPS unit. With it you'll get free, lifetime real-time traffic alerts, turn-by-turn voice guidance, 3D lane assist and many other features. IfMagellan RoadMate (iPhone App) Review
you already own an iPhone and want a GPS, this is an excellent alternative to buying a traditional unit.