I don't know about the Roadmaster TripMaker, But i do have a Garmin Nuvi 465t. It is the worst GPS in my opinion. Even though I have the Lifetime Update program, it still does not know the latest information on highways. It sent me down a dead end. It seems to send me on the roundabout route when in truck mode. Its search program is not up to date on businesses. I always have a watchful eye when it sends me to a destination.