Ordnance Survey of Northern Ireland

The Ordnance Survey of Northern Ireland (OSNI) is the official mapping agency of Northern Ireland.

The Institution

OSNI is the official producer of high quality, detailed and up-to-date geographic map data in Northern Ireland. The digital products range from vector databases, raster mapping and orthophotography to road maps and the printing of map products.

Further information about OSNI

Map Design

From Ordnance Survey of Northern Ireland (OSNI) we do have these three different map scales in place:

250k covering all of Northern Ireland
50k covering all of Northern Ireland
25k covering relevant outdoor regions in Northern Ireland

from left to right: 250k, 50k, 25k

Map Legend

Map Coverage

left: 25k - right: 50k