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- Reach RS4 vs S999
Emlid Reach RS4 vs Stonex S999
What Reach RS4 does better (2) and where S999 wins (0) — every spec side by side.
Why is Reach RS4 better than S999?
- Battery life16 h vs 10 h+60%
- Built-in UHF radioYes · S999: No
Why is S999 better than Reach RS4?
S999 has no measurable advantages in this pair.
Specifications
Side by side
| Satellite positioning | ||
| Satellite systems | GPS, GLONASS, Galileo, BeiDou, QZSS, NavIC (IRNSS) | GPS, GLONASS, Galileo, BeiDou, QZSS, NavIC (IRNSS) |
| Satellite systems supported | 6 | 6 |
| Multi-band GNSS (L1 + L5/L2) | Yes | — |
| Frequency bands | L1, L2, L5, E1, E5a, E6, B1, B2, B3 | — |
| Tracking channels | — | 1,408 |
| SBAS (WAAS / EGNOS) | — | Yes |
| RTK positioning | Yes | — |
| RTK accuracy (horizontal) | 7 mm | — |
| Tilt compensation (IMU) | Yes | Yes |
| Max. tilt angle | — | 60° |
| Correction sources | NTRIP (internet), UHF radio, LoRa radio | NTRIP (internet), Cellular modem, L-band / PPP, SBAS |
| Built-in UHF radio | Yes | No |
| L-band / PPP corrections | — | Yes |
| Maps & navigation | ||
| Internal storage | — | 31 GB |
| Connectivity & safety | ||
| Bluetooth | — | Yes |
| Cellular modem (4G / LTE) | — | Yes |
| USB-C | Yes | Yes |
| Camera | — | Yes |
| Battery & power | ||
| Battery life | 16 h | 10 h |
| Battery capacity | — | 13,600 mAh |
| Build & durability | ||
| Protection rating | IP68 | IP68 |
| Water protection (IPx) | IPx8 | IPx8 |
| Operating temperature (min) | -40 °C | -40 °C |
| Operating temperature (max) | 65 °C | 65 °C |
| Weight | — | 1,065 g |
| Width | — | 139 mm |
| Height | — | 74 mm |
| Depth | — | 139 mm |
| Housing material | Magnesium alloy | — |
