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. Considered the mainstay among serious outdoor enthusiasts, the GPSMAP 76CSx and GPSMAP 76Cx offer a large color TFT display and turn-by-turn routing capability. These units also float when dropped in the water. Each unit comes with a blank 128 MB microSD card. Owners of these 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. New high-sensitivity WAAS-capable GPS receiver by SiRF Built-in quad-helix receiving antenna with remote antenna capability Unit dimensions: 2.7? W x 6.2? H x 1.4? D Display: 1.5? W x 2.2? H, 2.6?-diagonal, 256-color, transflective TFT (160 x 240 pixels) Weight: 7.6 ounces with batteries (not included) Sensors: -Electronic compass displays accurate heading while standing still -Barometric altimeter with automatic pressure trend recording microSD card slot allows for storage of optional MapSource detail (128 MB microSD included) LED backlit display and keypad Battery life: 20 hours (typical use) using two AA alkaline batteries Includes a built-in Americas autoroute basemap with automatic routing capabilities, including highways, exits, and tide data (USA only) Internal memory is preloaded with a marine point database 1,000 user waypoints with name and graphic symbol; 50 reversible routes Position formats include Lat/Lon, UTM, Loran TDs, Maidenhead, MGRS, user grid, and more Audible alarms for anchor drag, arrival, off-course, proximity waypoint, and clock Large-numbers option for easy viewing; dual-position