Great Britain launch source
Ordnance Survey maps in OMN4
OMN4 includes licensed Ordnance Survey mapping for Great Britain, subject to subscription. Use the maps for route planning, offline preparation, mobile field use, and desktop printing.
1:25,000 Explorer mapping
Detailed Great Britain mapping for walking, hiking, running, off-road cycling, rights of way, open access land, and close route work.
1:50,000 Landranger mapping
A broader Great Britain view for longer routes, cycling, touring, and route planning across larger areas.
OS VectorMap Local detail
OMN4 Pro GB adds OS VectorMap Local detail for a maximum-resolution Great Britain map option.
OS Imagery / aerial context
Use aerial context where field boundaries, buildings, tracks, or terrain detail help you understand the ground.
Plan with Ordnance Survey mapping
Use licensed Great Britain mapping as part of the wider OMN4 route and map workflow.
Download before you go
Prepare map areas on the device that will use them, then check status, storage, and verification.
Print a paper backup
Use desktop printing when scale, grid detail, and paper backup matter for the route or area.
Explore Ordnance Survey map pages
Individual map pages help visitors connect a named Ordnance Survey sheet with the broader OMN4 map-source and subscription context.
Map help
For the operational detail on choosing, downloading, storing, and verifying maps in OMN4, use the map help centre.