Precision GNSS, RTK & Timing Solutions — Engineered Wherever Precision Matters
All four models use the same u-blox ZED-F9P engine and reach the same accuracy, so the choice comes down to how you work in the field: which role the unit plays, which app you use, and whether it needs its own battery and buttons.
| Product | GR-903 | GR-9028 | GR-9029 | GR-901 |
|---|---|---|---|---|
| Product type | RTK receiver (base and rover) | RTK base station | RTK data logger | RTK receiver (base and rover) |
| RTK base (NTRIP caster ready) | Yes (Android, Windows) | Yes (Android, iOS) | No | Yes (Windows) |
| RTK GNSS data logger | Yes (Android) | No | Yes (Android, iOS) | Yes (Windows) |
| RTK GNSS receiver | Yes (Android, Windows, Linux) | No | Yes (Android) | Yes (Windows) |
| Comes with iOS app | No | Yes (BLERTK) | Yes (BLERTK) | No |
| Comes with Android app | Yes (SPPRTK) | Yes (BLERTK) | Yes (BLERTK) | No |
| Location sharing feature | Yes (SPPRTK app, Android only) | No | Yes (BLERTK app, Android only) | Yes (Windows) |
| Physical ON/OFF button | No | Yes | Yes | No |
| Physical POI button (waypoint collection) | No | No | Yes | No |
| Stakeout function | Yes | No | Yes | Yes |
| USB connector | Type A (male), power and data | Type C (female), charging only | Type C (female), charging only | Type A (male), power and data |
| Bluetooth protocol / profile | SPP | BLE | BLE | No |
| Built-in rechargeable battery | No | Yes | Yes | No |
| RTK protocol | RTCM 3.3 | RTCM 3.3 | RTCM 3.3 | RTCM 3.3 |
| RTK GNSS chip | u-blox ZED-F9P | u-blox ZED-F9P | u-blox ZED-F9P | u-blox ZED-F9P |
| Accuracy | 1.4 cm (1 cm + 1 ppm) | N/A | 1.4 cm (1 cm + 1 ppm) | 1.4 cm (1 cm + 1 ppm) |
| Waterproof | IPX7 | IPX7 | IPX7 | IPX7 |
| GNSS band | L1 / L2 dual band | L1 / L2 dual band | L1 / L2 dual band | L1 / L2 dual band |
This table covers the portable base, rover and logger models. For RTK mounted on a UAV or built into your own system, see GR-906, GR-905 and GM-905, or the full RTK product range.
Tell us how you work in the field and where corrections will come from, and we will suggest the pairing that fits.
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