Great Britain map index
Ordnance Survey Explorer maps
Browse 1:25,000 Explorer sheets for detailed Great Britain route planning, walking, hiking, running, off-road cycling, and local outdoor map work. These generated pages connect named Ordnance Survey sheets with OMN4 map-source, subscription, download, printing, and help context.
Explorer scale
Explorer mapping is the more detailed 1:25,000 Ordnance Survey scale, useful when paths, rights of way, field boundaries, open access land, and close route decisions matter.
Use inside OMN4
Use licensed Ordnance Survey mapping with route planning, offline map downloads, GPX workflows, and desktop printing, subject to subscription.
Attribution applies
Public screenshots or static images that reproduce Ordnance Survey mapping need the required source acknowledgement.
Outdoor Leisure Explorer maps
OL sheets cover many of Great Britain's most visited national parks and outdoor areas.
Numbered Explorer maps
Numbered 1:25,000 Explorer sheets cover local walking, cycling, and route-planning areas across Great Britain.