garmin V has mapping capabilities with city select, metro and topo maps
with turn by turn intructions. works great with handle bar mount with cig. lighter charger.
I know others have the same capabilities.
I have two for a couple of my quads.
Also have a garmin QUE 3600 but not sutable for quad ride in.
all units are good just depending on how much ya want to shell out for them.