GPS Kit for the iPhone Video Review
There's been a great deal of buzz about the TomTom app for the iPhone, along with reviews of other turn-by-turn navigation apps. There's a different way people use GPS units though, and it rarely has anything to do with driving directions.
GPS Kit re-creates the aspects of a GPS that are useful to people trekking on foot, whether it's hiking, selling something door-to-door, or maybe fishing at a favorite lake. GPS Kit does a great job of showing you where you've been, and where you're going with the kind of data expected from a rugged gps: pace, elevation, time, speed, and path travelled are all displayed.
I recently tested the app at a local state park, and found it to be a wonderful addition. At a glance I could see how far I'd gone, how long it would take me at my current pace, etc.
One other note: if you are actively using the app while on a long trail, you might want to consider an external battery/case combo for the iPhone, as the battery will drain within a few hours.
UPDATE: We've been contacted by the developer and want correct an error in the first posting and video review: GPS Kit only uses the cell network to download map info. Once you have that for the area you're headed into, you should be fine even without a cell network.
Take a Look: