| 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 |
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| Floats |
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| GPS Receiver | MultiTrac8 | MultiTrac8 | MultiTrac8 | MultiTrac8 | PhaseTrac12 |
| Tracked Satellites | 8 (multiplexed) | 8 (multiplexed) | 8 (multiplexed) | 8 (multiplexed) | 12 (parallel) |
| Quad Helix GPS Antenna |
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| Patch GPS Antenna |
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| External GPS Antenna |
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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 |
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| Compass | GPS | GPS | GPS | GPS | GPS |
| Tides |
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| Sunrise & Sunset |
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| Moon Phase |
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| Hunt & Fish Calendar |
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| Area Calculation |
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| Audible Alarms |
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| Anchor Alarm |
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| Proximity Alarms |
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| Point-to-Point Navigation |
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| On Road Navigation |
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| MOB |
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| TracBack |
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| Trip Info |
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| Track Log | 768 pts | 768 pts | 768 pts | 768 pts | 1,024 pts |
| Tracks (points per track) |
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| Routes (points per route) | 20 (30) | 20 (30) | 20 (30) | 20 (30) | 20 (30) |
| Waypoints | 250 | 250 | 250 | 250 | 500 |
| Waypoint Icons |
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| Project Waypoint |
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| Languages | 1 | 1 | 1 | 1 | 9 |
| Internal Memory |
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| Expandable Memory |
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| City Database |
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| Nearest Cities |
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| Navaid Database |
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| POI Database |
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| Firmware Upgrades |
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| GPS 38 | GPS 40 | GPS 45 | GPS 45XL | GPS 48 |
