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- GPSMAP 66i vs Terra
Garmin GPSMAP 66i vs TwoNav Terra
What GPSMAP 66i does better (1) and where Terra wins (3) — every spec side by side.
vs
5.4Display8.6
6.7Battery3.5
7.2Durability6.7
Dimensions
Size comparison
GPSMAP 66iTerra
| GPSMAP 66i | Terra | Difference | |
|---|---|---|---|
| Height | 163 mm | 115 mm | +48 mm |
| Width | 62 mm | 80 mm | −18 mm |
| Depth | 35 mm | 19 mm | +16 mm |
| Weight | 230 g | 198 g | +32 g |
Drawn to the same scale from the official dimensions (front and side).
Why is GPSMAP 66i better than Terra?
- Battery life35 h vs 19 h+84%
Why is Terra better than GPSMAP 66i?
- Screen size3″ vs 3.7″+23%
- Internal storage16 GB vs 32 GB2×
- Weight230 g vs 198 g+16%
Specifications
Side by side
| Satellite positioning | ||
| Satellite systems | GPS, Galileo | — |
| Satellite systems supported | 2 | — |
| Multi-band GNSS (L1 + L5/L2) | No | — |
| Raw data logging (RINEX) | Yes | — |
| Display | ||
| Screen size | 3″ | 3.7″ |
| Resolution | 240 × 400 | 480 × 640 |
| Horizontal resolution | 240 px | 480 px |
| Vertical resolution | 400 px | 640 px |
| Pixel density | 155 ppi | — |
| Display type | Transflective colour (sunlight-readable) | Transflective colour (sunlight-readable) |
| Touchscreen | — | Yes |
| Maps & navigation | ||
| Preloaded maps | Yes | — |
| Map types | Road, Topographic, Satellite imagery | — |
| Turn-by-turn routing | Yes | — |
| Satellite imagery | Yes | — |
| Internal storage | 16 GB | 32 GB |
| Memory card slot | Yes | — |
| Barometric altimeter | Yes | — |
| Waypoints | 10,000 | — |
| Connectivity & safety | ||
| Two-way satellite messaging | Yes | — |
| SOS / emergency alert | Yes | — |
| Satellite network | Iridium | — |
| Wi-Fi | Yes | Yes |
| Bluetooth | Yes | Yes |
| ANT+ | Yes | — |
| USB-C | — | Yes |
| Smartphone notifications | Yes | — |
| Flashlight | Yes | — |
| Battery & power | ||
| Battery life | 35 h | 19 h |
| Battery capacity | — | 3,000 mAh |
| Power source | Built-in rechargeable | — |
| Build & durability | ||
| Protection rating | IPX7 | IP67 |
| Water protection (IPx) | IPx7 | IPx7 |
| MIL-STD-810 | Yes | Yes |
| Operating temperature (min) | — | -20 °C |
| Operating temperature (max) | — | 70 °C |
| Weight | 230 g | 198 g |
| Width | 62 mm | 80 mm |
| Height | 163 mm | 115 mm |
| Depth | 35 mm | 19 mm |
