With expandable memory, this navigational workhorse guides you to your destination with a crisp, sunlight-readable color display. Sunlight-readable, highly reflective color display provides easy viewing in almost any lighting conditions. SiRFstar III chipset provides rapid first fix and is sensitive enough to acquire signals in urban canyons and under dense foliage. Expandable memory has unlimited potential with the addition of larger sizes of microSD cards sold separately includes 64 MB card. Fast USB connectivity makes loading charts and maps quick and easy interface cable included. Electronic compass provides accurate bearing while standing still. Precise barometric sensor with pressure trend recording tracks elevation gain and loss as well as weather trends. Follow your route, marking up to 50 reversible routes find your way back with Garmins exclusive TracBack feature. Fast processor scrolls through screens and pans quickly. Trip computer calculates current and average speed, sunset and sunrise, trip time and distance. Proximity alerts sound at arrival, off-course, waypoint and anchor drag. WAAS-enabled Wide Area Augmentation System receiver delivers accuracy to 10 feet in North America. Waterproof construction keeps unit functioning meets IEC 60529 lPX7 standards submerge 1-meter for 30 minutes. Dedicated geocaching mode and GPS games turn the outdoors into a giant gameboard. Comes with: MapSource Trip and Waypoint Manager software, PC USB interface cable, lanyard, manual and quick start guide. Compatible with MapSource BlueChart , U.S. Topo 24K, and City Select .