How to Connect Your GNSS RTK Device
Walk your registered boundary corners to centimetre accuracy

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DataGNSS NANO Helix RTK — the kit arrives ready to use.

The Device We Recommend

For homeowners in England and Wales who want to walk their registered boundary, we recommend the DataGNSS NANO Helix RTK. It is affordable (from around £80), compact, and connects to both a laptop and a smartphone straight out of the box.

With a free RTK correction service, the NANO achieves around 2 centimetres of positional accuracy — enough to stand on the approximate position of a buried boundary marker. No professional surveying experience is needed.

Full specifications, pricing, and where to buy →

Method 1: Connect via BoundaryFinder

Best for: Laptop • Desktop • Tablet — Chrome or Edge

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The GNSS panel on your BoundaryFinder preview page.

Your BoundaryFinder preview page has a built-in GNSS connection panel. Connect the NANO, click one button, and the map shows your live position against your registered boundary — updating in real time as you walk.

This method uses the Web Serial API, which is built into Chrome and Edge on laptops, desktops, and most tablets. It does not work in Safari, Firefox, or any smartphone browser — for those, use Method 2.

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The RTK corrections panel.

🏗 Upgrade to centimetre accuracy with RTK

Click Enable RTK Corrections inside the GNSS card. RTK uses signals from a nearby base station to boost accuracy from ~3 m to ~2 cm.

A free RTK service is already set up. Select rtk2go.com from the provider dropdown — the username and password are pre-filled. Click Connect and wait up to 60 seconds for the status badge to change to RTK Fixed.

rtk2go is free and community-run — coverage varies by area. For reliable nationwide UK coverage, OS Net (~£500/yr) is the professional standard.

Method 2: Connect with SW Maps

Best for: Android • iPhone • iPad — any smartphone or tablet

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Android: OTG cable connects the NANO for data and power.

SW Maps is a free surveying app available for Android and iPhone. It uses the NANO as your phone’s GPS source, giving you centimetre-level accuracy on the map. Your BoundaryFinder report includes a GPX file of your boundary corners — import it into SW Maps and your corners appear as waypoints to walk to.

Download SW Maps free from the Google Play Store or App Store.

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Android

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SW Maps → USB Serial GNSS

1. Connect the NANO to your phone using a USB-C OTG cable (included in the Surveyor Kit)
2. In SW Maps go to Settings → GNSS Receiver → USB Serial GNSS
3. Select the NANO from the list
4. Import your GPX boundary file via Project → Import

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iPhone & iPad

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Pair the NANO in iOS Bluetooth settings first

1. Pair the NANO in your iPhone’s Bluetooth settings first
2. In SW Maps go to Settings → GNSS Receiver → Bluetooth GNSS
3. Select the NANO from the list
4. Import your GPX boundary file via Project → Import