Map Updates
Update your downloaded maps when newer mapping becomes available. OMN4 replaces the parts that have changed and keeps the unchanged mapping, so you do not need to delete and download the whole area again.
Map-data updates are separate from updates to the OMN4 app. An Update available banner offering a new OMN4 version refers to the app; use Map Management to update downloaded mapping.
Update maps already on this device
- Connect to the internet and let OMN4 finish syncing. If you have just been told a map update is available, restart OMN4 so it can check the latest mapping for your account.
- Open the round three-line menu button at the bottom right of the map, then choose Map Management.
- Expand the relevant area under My Areas and find your map type, such as OS 1:50,000. Older downloaded mapping is labelled Partial Outdated or Downloaded Outdated.
- Open the map type's three-dot menu and choose Update All. On desktop, you can also select the row and use Update All in the toolbar above the map. Check the download size before starting.
- Let the download and processing finish. The affected coverage turns green as the current mapping is installed.
Update All updates the coverage you already have on this device. Update & Download All also downloads the remaining mapping for the selected area. You can skip editions: you do not need to install each update in turn.
On mobile, downloads follow Settings > Data > Map Download. A Wi-Fi-only setting can leave an update queued until Wi-Fi is available.
Follow the colours
Select the map to see its coverage shading. On mobile, open the map row's three-dot menu and choose Select mapping, or Download part of this map... if only part is downloaded.
| Colour | Meaning |
|---|---|
| Orange | Older downloaded mapping that can be updated. |
| Yellow | Mapping queued or requested for download. |
| Green | Current mapping downloaded on this device. |
| Purple | Squares you have selected for an action. |
During an update, affected orange coverage becomes yellow, then green. Parts that have not changed can stay green throughout. Use Fit to coverage, the button with two diagonal arrows pointing apart, to see the whole area.
Check that the update has finished
When the update is complete:
- The updated downloaded coverage is green.
- The map row shows On device or Partial on device, without an outdated label.
- Update All is no longer offered for that coverage.
The final stored size may change only slightly even when a sizeable update was downloaded: the new files replace the superseded files, while unchanged files are reused.
Downloaded maps are managed per device. Updating a phone does not update the same maps on your tablet or desktop. Not every map release changes the area you have downloaded.
If an update still appears unfinished after the work stops, restart OMN4 and check again. If mapping looks incomplete or wrong, use Verify Map Data from Map Management.