My Nuvi 750 allows me to create a route in Basecamp and upload up to 10 routes the the nuvi. I upgraded my nuvi 250 to the 750 to get this feature but found I never really used the feature because it is easier to drag the waypoints into the nuvi favorites.
I was looking at the new Garmins from the comparison page. Can someone tell me how to determine if the new Garmins will allow BaseCamp to upload routes.