How about a simple arrow that points to your Destination or waypoint. So maybe you put in a destination to start the navigation and then a simple page with an arrow points in the direction of the destination with a distance as the crow fly's.
This is similar in principle to some hardware devices that are coming to the cycling market place but as a Garmin owner why do I need another piece of hardware. Ideally I'd like to reuse the hardware I already have on my handlebars.