| | Navigation |
| ‧ | Waypoints: Maximum 1000 waypoints with name (symbol) coordinate and remarks. |
| ‧ | Route: 50 reversible and editable routes with up to 150 waypoints each. |
| ‧ | Track Log: 8 tracking logs 2500 points each. |
| | maps |
| ‧ | Built-in NAND flash memory support worldwide map. (GM-120C) |
| | Performance |
| ‧ | Acquisition Time: |
| ‧ | Cold Start : Within 42 seconds |
| ‧ | Warm Start : Within 38 seconds |
| ‧ | Hot Start : Within 1 second |
| ‧ | Update Rate : 1 second continuously |
| | Accuracy |
| ‧ | Position : Within 5 - 25 m CEP |
| ‧ | Velocity : 0.1 m / sec |
| ‧ | Time : ±1μs |
| | Dynamics |
| ‧ | Altitude : -1,000 to + 18,000 m |
| ‧ | Velocity : 515 m/sec |
| ‧ | Acceleration : ±4G |
| | Interface |
| ‧ | Virtual USB Com Port |
| ‧ | Antenna : Built-in patch antenna. |
| ‧ | Alarm : Built-in beeper for warning message. |
| | Physical |
| ‧ | Size: 109 x 59 x 22.8 mm |
| ‧ | Weight: 130 ± 5 g, with Li-Ion battery. |
| ‧ | Case: Waterproof to IPX6 standards |
| | Display |
| ‧ | High-contrast electro luminescent back light display 4 level gray scale LCD. |
| ‧ | Size : 58 × 36 mm, 2.7" |
| ‧ | Resolution : 100 ×160 pixels |
| | Power |
| ‧ | Battery: |
| ‧ | Replaceable & rechargeable Li-Ion batteries, 1600 mAh |
| ‧ | External power: mini-USB Adapter |
| ‧ | Power consumption: 240 mW(GM-120A), 270 mW(GM-120B), 285 mW(GM-120C) |
| | Temperature |
| ‧ | Operating : -10 ～ 60 degree centigrade |
| ‧ | Storage : -20 ～ 70 degree centigrade |
| | Misc |
| ‧ | 5 Function keys, 1 rocking keypad for 4 directions. |
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