Garmin Vista HCx GPS is fat on features and lean on size This compact model features a high-sensitivity chipset for superb reception. High-sensitivity chipset delivers super-fast signal aquisition and lock for reception in narrow valleys, dense woodlands and urban jungles. Expandable memory accommodates microSD cards up to 4GB in capacity sold separately. Upload detailed maps via USB interface cable included power is supplied through interface. 256-color TFT technology produces a bright, sunlight-readable display. Electronic compass provides accurate bearing while standing still. Precise barometric sensor with pressure recording tracks elevation gain and loss, as well as weather trends. Comes pre-loaded with U.S. basemap accepts detailed maps from MapSource software sold separately. Follow 50 reversible routes with 1,000 user waypoints with names and graphic symbols. Audible alarms for anchor drag, arrival, off-course, proximity waypoint and clock. Trip-computer calculates current and average speed, sunset and sunrise, trip time and distance. Weatherproof case keeps unit functioning in wet conditions waterproof to IEC 529 lPX7 standards. WAAS-enabled Wide Area Augmentation System receiver delivers sub-3-meter accuracy. Two AA batteries supply up to 25 hours of typical use batteries sold separately. Compatible with most MapSource products including BlueChart , City Select and U.S. TOPO 24K. Comes with: PC/USB interface cable, MapSource Trip and Waypoint Manager CD-ROM, lanyard, owners manual and quick reference guide.