Features: Sunlight-readable, four-level grayscale transflective FSTN display (3.8 W x 5.6 H cm; 6.6 cm diagonally)(160 x 240 pixels) 1 MB of internal memory for storing MapSource POI data Internal memory is preloaded with worldwide cities Permanent user data storage; no memory battery required Each day's best hunting and fishing times - along with sunrise/sunset times - on the integrated Outdoor Calendar Special geocaching navigation mode Geolocation games, such as Virtual Maze, Nibbons, Geko™ Smak, and Memory Race Fast data transfer, with support for both USB and serial port interfaces; navigation instructions can be shared with repeaters, plotters, and autopilots using NMEA protocols through the dedicated serial port Dedicated "mark", "page", "enter", "quit", "menu", "find",and "zoom out/in" buttons; four-position rocker pad 6.1 x 15.5 x 3.3 cm (W x H x D) unit dimensions Weighs 153 grams (without batteries), 213 grams (with batteries) Built-in quad-helix antenna for better satellite reception 28 hours of battery life under typical-use conditions (uses two "AA" batteries) Multi-platform navigation for easy navigation in a car or boat, or on foot Waterproof to IEC 60529 IPX7 standards (can be submerged in one meter of water for up to 30 minutes) 50 reversible routes, 10,000 track points with tracBack® technology (navigate to any track point on the displayed map), and 500 waypoints with additional graphical icons for location identification Proximity alerts for anchor drag, arrival, off-course, proximity waypoint; built-in alarm clock Trip computer provides odometer, stopped time, moving average, overall average, total time, max speed, and more Waypoints: 500 with name and graphic symbol, 10 nearest (automatic), 10 proximity Routes: 50 reversible routes with up to 250 points each, plus MOB and TracBack® modes Tracks: 10,000-point automatic track log; 20 saved tracks, 500 points each, let you retrace your path in both directions Trip computer: Current speed, average speed, resettable maximum speed, trip timer, and trip distance Alarms: Anchor drag, approach and arrival, off-course, proximity waypoint, shallow water, and deep water Tables: Built-in celestial tables for best times to fish and hunt; sun and moon rise, set, and location Map Datums: More than 100 plus user datums Position format: Lat/Lon, UTM/UPS, Maidenhead, MGRS, Loran tds, and other grids, including user grid Performance: Receiver WAAS-enabled, 12 parallel channel GPS receiver continuously tracks and uses up to 12 satellites to compute and update your position Acquisition Times Warm: Approx. 15 seconds Cold: Approx. 45 seconds AutoLocate®: Approx. 5 minutes Update Rate: 1/second, continuous Accuracy Position: < 15 meters, 95% typical* Velocity: 0.05 meter/sec steady state DGPS (USCG) Accuracy Position: 3-5 meters, 95% typical* Velocity: 0.05 meter/sec steady state DGPS (WAAS) accuracy Position: < 3 meters, 95% typical* Velocity: 0.05 meter/sec steady state Dynamics 6g's Interfaces USB, RS232 with NMEA 0183, RTCM 104 DGPS data format and proprietary GARMIN Antenna Built-in quadrifilar, with external antenna connection (MCX) Differential DGPS, USCG and WAAS capable Physical Size: 61W x 155 H x 33 D mm (2.4" x 6.1" x 1.3") Weight: Weighs 153 grams (without batteries), 213 grams (with batteries) Display: 38mm x 56mm (1.5" x 2.2" ) 160 x 240 pixels, high resolution, FSTN Case: ** Waterproof to IPX-7 standards Temp. Range: -15°C to 70°C (5°F to 158°F) Power: Memory Backup: Indefinite, no memory battery required Power: Two "AA" batteries (not included) Battery Life: Up to 28 hours (typical use)