Precision GPS for Boundary Finding
Connect an external GNSS receiver to BoundaryFinder for live sub-metre accuracy when walking to your boundary points — directly in your browser, no extra apps required.
Why Use an External GNSS Receiver?
Your smartphone GPS is good enough for most boundary-finding tasks — modern phones achieve 1–3 metre accuracy. But an external GNSS receiver gives you a noticeable step up:
Smartphone GPS
1–3 m accuracy
Gets you within a few paces of your boundary — but 2–3 metres is a large area when you’re looking for a buried marker or trying to establish exactly where a fence should go.
External GNSS Receiver
Sub-metre accuracy
A multi-frequency GNSS receiver narrows your search area dramatically — the difference between “somewhere in this 5-metre circle” and “dig here”. Essential for buried pegs, open paddocks, and disputed boundaries.
Key Advantage: Live On-Page Navigation
When you connect a GNSS receiver to BoundaryFinder, your position updates live on the map in your browser. You can see all your boundary points at once and walk directly to each one — no switching between apps, no copy-pasting coordinates into Google Maps.
How It Works
- Pair your GNSS receiver to your phone or laptop via Bluetooth (one-time setup in your device’s Bluetooth settings).
- Open your BoundaryFinder report — scan the QR code or use the link from your email.
- Tap “Connect GNSS Device” on the preview page. Chrome will show your paired devices — select your receiver.
- Walk to your boundary points with live guidance. Your position appears as a blue dot on the map, with real-time distance and direction to each boundary corner.
Browser Compatibility
The GNSS connection feature uses the Web Serial API, which is supported in Chrome on Android and Desktop. iPhone (Safari) and Firefox users can still use their phone’s built-in GPS — the GNSS button simply won’t appear on unsupported browsers.
What You’ll See on the Preview Page
Once connected, your BoundaryFinder preview page shows:
A blue marker on the map showing your real-time location as you walk.
Live distance (in metres) and compass direction to each boundary point.
Connection state, satellite count, and accuracy reading — so you know when to trust your position.
See every boundary corner on one map. No switching between apps or re-entering coordinates.
Our Recommended Devices
When you’re searching for a buried peg, 2–3 metres accuracy is a large area to search — that’s barely better than your phone. These two sub-metre receivers make an actual difference:
GM906BT Dual-Frequency GNSS
| Accuracy | ~0.5–1 m (dual-frequency L1+L5) |
| Connection | Bluetooth SPP, NMEA-0183 |
| Battery | ✗ No internal battery — requires USB power bank |
| Setup | Pair via Bluetooth, tap Connect — done |
| Price | ~NZ$180–$340 on Amazon Australia |
Why this device? The best sub-metre accuracy for the price. Dual-frequency L1+L5 tracking gives you 0.5–1 m precision — enough to say “dig here” rather than “somewhere in this circle”. The trade-off: no internal battery, so you’ll need a small USB power bank in your pocket while walking.
View on Amazon Australia →Columbus P-7 Pro Multi-GNSS
| Accuracy | Sub-metre (multi-frequency, six constellations) |
| Constellations | GPS + GLONASS + BeiDou + Galileo + QZSS + SBAS |
| Battery | Built-in rechargeable |
| Connection | Bluetooth SPP 2.1 + BLE 5.1 — use SPP mode |
| Rating | IP66 waterproof |
| Setup | Pair via Bluetooth, tap Connect — done |
| Price | ~NZ$350–$600 (AliExpress) |
Why this device? Sub-metre accuracy with a built-in battery and IP66 waterproofing — no power bank needed. Tracks six satellite constellations including QZSS (which provides additional coverage over New Zealand and Australia) for consistent positioning in any conditions.
View on AliExpress →Other Compatible Devices
Any GNSS receiver that outputs NMEA-0183 sentences over Bluetooth or USB will work with BoundaryFinder. Here are other options — though bear in mind that devices with 2–3 m accuracy offer only a marginal improvement over your phone:
Garmin GLO 2 Bluetooth GPS
| Accuracy | ~2–3 m (GPS + GLONASS + SBAS) |
| Battery | Built-in rechargeable — up to 13 hours |
| Connection | Bluetooth SPP |
| Price | ~NZ$150–$220 |
Excellent battery life, but 2–3 m accuracy is only a small step up from a modern phone. Best suited for general positioning rather than pinpointing buried markers.
Search on Amazon Australia →Bad Elf GPS Pro+ / Flex
| Accuracy | ~1–2 m (sub-metre capable) |
| Battery | Built-in rechargeable — 8–35+ hours |
| Connection | Bluetooth, NMEA output |
| Price | ~NZ$280–$450 |
Better accuracy than the Garmin GLO 2, with excellent battery life. Check stock availability in NZ.
Search on Amazon Australia →Qstarz BT-Q1000XT
| Accuracy | ~3–5 m |
| Battery | Built-in rechargeable — up to 42 hours |
| Connection | Bluetooth SPP |
| Price | ~NZ$180+ |
Budget option with exceptional battery life. Slightly lower accuracy but reliable Bluetooth connection.
Search on Amazon Australia →Quick Comparison
| Device | Accuracy | Battery | Price (approx.) |
|---|---|---|---|
| Your smartphone | 1–3 m | — | Already own |
| GM906BT ✓ | 0.5–1 m | External (power bank) | NZ$180–$340 |
| Columbus P-7 Pro ✓ | Sub-metre | Built-in | NZ$350–$600 |
| Bad Elf Pro+/Flex | 1–2 m | 8–35 hrs | NZ$280–$450 |
| Garmin GLO 2 | 2–3 m | 13 hrs | NZ$150–$220 |
| Qstarz BT-Q1000XT | 3–5 m | 42 hrs | ~NZ$180 |
Frequently Asked Questions
Do I need a GNSS receiver?
No. Your smartphone GPS works well for most boundaries. A GNSS receiver is an optional upgrade for customers who want more consistent accuracy — especially useful in open paddocks, rural areas, or when locating buried markers.
Does it work on iPhone?
The live GNSS connection feature requires Chrome browser (Android or desktop). iPhone users can still use their phone’s built-in GPS to navigate to boundary points — the GNSS button simply won’t appear on unsupported browsers.
Do I need any apps?
No. Everything runs in your browser. Just pair the device via Bluetooth, open your BoundaryFinder report in Chrome, and tap “Connect GNSS Device”.
Will my existing GNSS receiver work?
Yes — any receiver that outputs NMEA-0183 sentences over Bluetooth SPP or USB is compatible. This includes devices from Garmin, Bad Elf, Trimble, Leica, u-blox, and many others.
How accurate are the boundary coordinates?
The GPS coordinates in your BoundaryFinder report are derived from LINZ (Land Information New Zealand) cadastral parcel data. They represent the official registered boundary position. The GNSS receiver simply helps you walk to those coordinates more precisely.
Ready to find your boundary? Your smartphone gets you close, but a sub-metre GNSS receiver gets you there. Connect it to BoundaryFinder for live on-screen navigation to each boundary corner.