In my Etrex, I use
Tracks4Australia maps when travelling in Australia, and
New Zealand Open GPS maps for NZ. To download the maps to the GPS from my PC I use
Garmin Trip & Waypoint Manager.
Navigation features:-
• Waypoints/icons: Name and graphic symbol
• Tracks: Automatic track log; 10 saved tracks let you retrace your path in both directions
• Routes: 20 reversible
• Trip computer: Current speed, average speed, time of sunrise/sunset, resetable maximum speed, trip timer and trip distance
• Map datums: More than 100
• Position format: Lat/Lon, UTM/UPS, Maidenhead, MGRS, Loran TDs and other grids
GPS performance
• Receiver: 12 parallel channel GPS receiver continuously tracks and uses up to 12 satellites to compute and update your position
Acquisition times
• Warm: Approximately 15 seconds
• Cold: Approximately 45 seconds
• AutoLocate (TM) Approximately 5 minutes
• Update rate: 1/second, continuous
GPS accuracy
• Position: < 15 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: RS232 with NMEA 0183, RTCM 104 DGPS data format and proprietary GARMIN
• Antenna: Built-in patch
• Power Source: 2 "AA" batteries
Physical
• Size: 4.4 "H x 2.0" W x 1.2"D (11.2 x 5.1 x 3.0 cm)
• Weight: 5.3 ounces (150g) with batteries
• Display: 2.1"H x 1.1"W (5.4 x 2.7 cm) high-contrast LCD with bright backlighting
• Case: Waterproof to IEC 60529 IPX7 standards
• Temperature range: 5 Deg F to 158 Deg F (-15 Deg C to 70 Deg C)
• User data storage: Indefinite, no memory battery required
* Subject to accuracy degradation to 100m 2DRMS under the U.S. Department of Defence imposed Selective Availability Program.