I bought this unit one month before getting my IPad 2 wifi + 3G, which is why I haven’t used it. Users can load map data and transfer routes and waypoints through the unit's fast USB connection. This unit features a removable microSD card, located inside the waterproof battery compartment...

- Select almost any region in the world - Data is from http://www.openstreetmap.org/ - Installable into MapSource, Roadtrip or download as a gmapsupp.img file. I haven't seen any trails in this for our area. No Topo either, but have been able to easily get street maps which are routable...