Garmin GPS Features


  GPS 38 GPS 40 GPS 45 GPS 45XL GPS 48
Weight  9.5 oz (269 g) 9.5 oz (269 g) 10.0 oz (284 g) 10.0 oz (284 g) 10.0 oz (284 g)
Display Size  2.6" 2.6" 2.6" 2.6" 2.6"
Display Resolution  100 x 64 100 x 64 100 x 64 100 x 64 100 x 64
Battery Type  AA x 4 AA x 4 AA x 4 AA x 4 AA x 4
Battery Life 12 / 20 hrs 10 / 20 hrs 10 / 20 hrs 10 / 20 hrs 24 hrs
Waterproof
Floats 
GPS Receiver MultiTrac8 MultiTrac8 MultiTrac8 MultiTrac8 PhaseTrac12
Tracked Satellites 8 (multiplexed) 8 (multiplexed) 8 (multiplexed) 8 (multiplexed) 12 (parallel)
Quad Helix GPS Antenna
Patch GPS Antenna 
External GPS Antenna MCX BNC BNC BNC
Cold Start (seconds) 120 120 120 120 45
Warm Start (seconds) 20 20 20 20 15
Accuracy (GPS) 15 m 15 m 15 m 15 m 15 m
Accuracy (DGPS) 5-10 m 5-10 m 5-10 m 5-10 m 1-5 m
Altimeter  GPS GPS GPS GPS GPS
Barometer 
Compass  GPS GPS GPS GPS GPS
Tides
Sunrise & Sunset
Moon Phase
Hunt & Fish Calendar 
Area Calculation 
Audible Alarms
Anchor Alarm
Proximity Alarms 9
Point-to-Point Navigation
On Road Navigation
MOB
TracBack
Trip Info
Track Log 768 pts 768 pts 768 pts 768 pts 1,024 pts
Tracks (points per track)
Routes (points per route) 20 (30) 20 (30) 20 (30) 20 (30) 20 (30)
Waypoints 250 250 250 250 500
Waypoint Icons 16
Project Waypoint
Languages 1 1 1 1 9
Internal Memory 
Expandable Memory
City Database
Nearest Cities
Navaid Database
POI Database
Firmware Upgrades
  GPS 38 GPS 40 GPS 45 GPS 45XL GPS 48