The GPSMAP 76CSx is a refreshing upgrade of the GPSMAP 76CS, one of our most popular models for outdoor and marine use. This unit 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. The GPSMAP 76CSx also incorporates a barometric altimeter for extremely accurate elevation data and an electronic compass that displays an accurate heading while standing still.