Apologies for beating this to death, but since my last post asking about a Garmin 1000, things have changed. I have a new iPhone, and Lifecase makes a nice case/battery that would make the phone fully useful for a long day on the bike.

What I'm looking for is an app that can not only track and record my route, but can also provide turn by turn directions from an uploaded GPX file. Is there such a beast?