GARMIN eTrex Summit HC Hand Held Receiver w/ Built in GPS Patch Antenna. New high sensitivity GPS receiver. 24 Mbyte of internal memory for storing detailed maps. WAAS enabled, 12 parallel channel GPS receiver. Built in GPS patch antenna. Display: 1.3 in W x 1.7 in H, 256 color, high resolution, transflective TFT /176 x 220 pixels.Electronic compass displays accurate heading while standing still. Barometric altimeter with automatic pressure trend recording. LED backlit display and keypad. Battery life: up to 32 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. 500 user waypoints with name and graphic symbol; 20 reversible routes, 50 points per route. Position formats include Lat/Lon, UTM, Loran TDs, Maidenhead, MGRS, user grid, and more. Audible alarms for anchor drag, arrival, off course and clock. Large numbers option for easy viewing, dual position display mode. Trip computer provides odometer, stopped time, moving average, overall average, total time, max speed and more. 10,000 point automatic track log; 20 saved tracks /500 points each/ let you retrace your path in both directions. Elevation computer /Summit HC/ provides current elevation, ascent/descent rate, minimum/maximum elevation, total ascent and descent, average and maximum ascent and descent rate. Built in celestial tables for best time to fish and hunt, plus sun and moon calculations. Fully compatible with MapSource products including BlueChart, City Navigator, U.S. TOPO 24K, U.S. TOPO and US Inland lakes. Waterproof, IEC 60529 IPX7, /Submersible 1 meter at 30 minutes