As navigon has been purchased by Garmin, would it be possible for BaseCamp to email waypoints that could be read by Navigon. For me Navigon is not an option for a Nuvi when on the Road but if you have a driver, it is useful to look at alternate routes. If you decide on a different route than chosen by the Garmin giving directions all you have to do it start the alternative route and the Garmin will recalculate. In my tests, the Garmin usually matches the Navigon after a couple of tries to get you back on the original route.
Thanks