How to prepare offline maps for field work without internet
Field work should not stop when internet disappears, but offline preparation must happen before leaving.
Field takeaways
- Capture, drawing and export can work offline; online basemaps and live corrections need connectivity.
- Download the work area map before the field day.
- Keep KML, DXF, CSV and project files on the phone.
- NTRIP/RTK live corrections may need internet.
- MapLab Survey preserves layers, notes, photos and exports offline.
Positioning does not need the internet
GNSS works from satellites, so location, measurement, calculation and export all continue without a connection. What disappears is the base map.
Download before you leave
Cache the area at the zoom levels you will actually use, and load reference KML or DXF files onto the device while you still have coverage.
What still needs a signal
Live NTRIP corrections depend on the mobile network. Without them, plan for a local base station or accept lower accuracy.
Battery is the real constraint
Out of coverage a phone drains itself hunting for a network. Use flight mode with GNSS on and carry a power bank.
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
How do I prepare offline maps?
Download the work area before field work.
Can measurement work offline?
Yes, capture and export can work offline.
Does RTK need internet?
NTRIP corrections usually do.
Can KML open offline?
Yes, if the file is on the device.
Technical references
The field guidance in this article is aligned with the technical and official references below.
Related: Offline field surveying · Open KML file · GPS track recording · MapLab Survey