I misplaced the original so here's a new thread. I use the iPhone gps professionally (maps and guidebooks and the like) and I have replaced my garmin (good riddance to them and their ilk), tomtom, camera, phone and iPod with this device. The integration is phenomenal; the photos are geotagged so you can see where you took them on a map. 

May I suggest motionX gps. Gps kit is harder to use but higher rated; it has stupid features that make you look up a waypoint to see the name instead of reading it on a map. 

If you like to do trails and see where you've been with milemarkers on map you can share by email, may I suggest the excellent app Cyclemeter. 

Write me If you have any questions. 

For driving directions the free app from mapquest is hard to beat at any price. I like the way I can drive along with Rhe phone on a windshield mount using the earphones listening to a book or music. When a turn comes up, the music is turned down and a voice comes on and announces the turn, then the music resumes. 

Jim