Navigation Features   Waypoints: Total: 500 Nearest: 9 (automatic) Proximity: 9 Routes: 20 reversible routes with up to 30 waypoints each, plus MOB and TracBack® modes TracBack: Automatic track log navigation with 1024 track log points Map Datums: Over 106 including a User Datum Coordinates: Lat/Lon, UTM/UPS, MGRS, Loran TDs, plus 7 grids, including Maidenhead and User Grid    Performance    Receiver: Differential-ready 12 parallel channel receiver continuously tracks and uses up to twelve satellites to compute and update a position Acquisition Times: Warm: approx. 15 seconds Cold: approx. 45 seconds Autolocate™: approx. 5 minutes EZinit: approx. 45 seconds Update Rate: 1/second, continuous Accuracy: Position: 15 meters (49 feet) RMS* 1-5 meters (3-15 feet) RMS with Garmin® GBR 21 DGPS receiver (optional) Velocity: 0.1 knot RMS steady state Dynamics: 6g's Interfaces: NMEA 180, 182, 183 and RTCM 104 DGPS corrections Antenna: Internal patch Temp. Range: 5°F to 158°F (-15°C to 70°C)  Physical     Size: 6.15 x 2 x 1.23 inches (15.6 x 5.1 x 3.1 cm) Weight: 9.5 ounces (269g) w/ batteries Display: 2.2 x 1.5 inches (5.6 x 3.8 cm) high-contrast LCD w/ electro-luminescent backlighting Case: Ultrasonically welded  Power      Memory Backup: Internal lithium battery Power Source: 10-40 VDC (4 AA batteries) Usage: 1 watt Battery Life: Up to 24 hours