Before you start
- The phone needs mobile data or Wi-Fi while downloading map tiles.
- OS mapping is visual context. It does not make phone measurements or imported boundaries survey-grade.
Step by step
- 1
Open Settings
Find OS OpenData background map and turn it on. AcreTrace uses the verified Light Web Mercator style so the field outline stays easy to read.
- 2
Turn the option on
AcreTrace will request free Light-style OpenData tiles directly from Ordnance Survey when a field map is shown.
- 3
Open a field
The saved boundary, exclusions, markers and current position are drawn over the OS background.
- 4
Keep working if reception drops
Measurements, saved records and the ordinary AcreTrace field plan continue to work. OS tiles are not required for calculations.
- 5
Export normally
PDF reports use AcreTrace's own clear schematic field plan; OS raster tiles are not copied into reports.
If you get stuck
If tiles cannot load, AcreTrace says that the OS background is unavailable and keeps the offline field plan visible. Check the connection and try again later.
Only free OpenData zoom levels 7 to 16 are requested, so the background is less detailed than premium OS mapping.
The API request goes to Ordnance Survey, whose terms and privacy information apply to that request.