I have a (relatively old now) Garmin zumo 550. I still believe it is the best GPS that Garmin ever made for use on a motorcycle, but that could start another whole debate. I await a (better) replacement with bated breath. The TMT (and VT Puppy Chow) routes will run on any garmin GPS running the North America series street maps, except in a very few short and insignificant sections. I happen to also have the NA topos running on my zumo when needed (another long discussion no doubt) but I would imagine that any semi-enterprising techno dweeb with a 'droid or iPhone would be able to navigate these routes with relative ease. These are not off-piste, bushwackin' routes. They are just a series of pleasant dirt roads, some more well maintained than others, but the vast majority are easily navigable in a Buick Roadmaster Convertible (at the right speed). The fun, my friend... is in the speed.