DESC: GPSMAP 60Cx Portable Navigator features a removable microSD card for detailed mapping memory and a waterproof, rugged housing. The microSD card slot is located inside the waterproof battery compartment. Users can load map data and transfer routes and waypoints through the unit's fast USB connection. In addition, this unit features a new, highly sensitive GPS receiver that acquires satellites faster and lets users track their location in challenging conditions, such as heavy foliage or deep canyons. Owners of new x-series handhelds can also purchase new microSD cards that are pre-loaded with MapSource Topo and inland lake maps, BlueChart marine cartography, and City Navigator street maps.