RTK GNSS on iPhone and Android: MapLab Survey workflow with an external receiver
A phone becomes a serious field tool when corrected external RTK GNSS position is combined with the right project, CRS and field records.
Field takeaways
- External RTK receivers commonly send corrected NMEA position to the phone over Bluetooth.
- NTRIP/CORS corrections are usually configured on the receiver side.
- MapLab Survey connects corrected position to project, layers, notes, photos and export.
- Do not record critical points before fixed status and known-point checks.
- Antenna height and vertical reference must be documented.
The chain, not the phone
Centimetre work on a phone comes from the receiver, the correction stream and the check, not from the handset. The phone runs the software and stores the data; the accuracy arrives over Bluetooth.
What each part does
The external GNSS receiver produces the position, an NTRIP correction service removes most of the atmospheric and orbital error, and the app records the result with its accuracy figure attached.
iOS and Android are equivalent here
Both accept standard NMEA over Bluetooth, so the platform matters far less than the receiver and the correction source.
Prove it before you rely on it
Measure a known point at the start of the day. If it agrees within tolerance, the chain is sound; if not, nothing measured afterwards is worth keeping.
Try these steps on your own phone.
MapLab Survey handles RTK/GNSS point capture, drawing, area and volume calculations and coordinate conversion, then exports to DXF, KML/KMZ, GeoJSON, Shapefile, GeoPackage, NCZ or CSV. Capture, calculation and export work offline. Live NTRIP corrections and online basemaps need a connection.
Frequently asked questions
Does MapLab Survey work with RTK receivers?
It supports a workflow for using external receiver position in field projects.
Is fixed status enough?
No. Use known-point checks.
Why antenna height matters?
It directly affects height values.
Technical references
The field guidance in this article is aligned with the technical and official references below.
Related: RTK GNSS field accuracy · GNSS Z and elevation · Field survey checklist · MapLab Survey