Using a Zumo 660 for 4x4/quadactivities.

Works OK in most conditions.
Good display and very robust device (it is waterproof - for sure :-) )

Be careful with route creation, they are recalculated when imported in the device

Other solution: Montana 660.

Difference : M660 uses traces only, no routes - which means no voice assistance. It is a pure outdoor/pedestrian type model.