The montana 610 uses gps and glonass connectivity to provide reliable positioning on all terrains with a track manager system that allows for easy organisation and navigation through routes and waypoints the montana 610 is a durable and user friendly gps system that is suited to all levels of walkers and hikers sailors and bikers the montana 610 discoverer bundle contains both the gps unit and the os 150k gb discoverer microsd card which contains detailed and expansive mapping of all of gre