iPhone app to follow/navigate an imported .gpx

Question

Is there an iPhone app that allows one to follow an imported .gpx track, in a car navigation-like way?

The apps I found so far, like Trails, can only display the track on a map. What I am looking for is a "download-and-forget" experience for my bike trips. I want to import a track and just look at my iPhone to tell me in which direction is the next waypoint, or how can I get back on track if I get lost.

Answer 1

I don't drive, ride, hike or use GPX myself, but here's an idea, using TomTom:

Get GSAK (thanks to tomtom's forums) to convert the GPX to a TomTom file format and add it (thanks to groundspeak forums) to your iPhone's TomTom.