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Ordnance Survey

The name Ordnance Survey applies loosely to various organisations responsible for mapping parts of the British Isles.
The sections under this heading in the navigation deal with Great Britain, Northern Ireland and the Irish Republic. The detail for the Isle of Man and the Channel Islands are below.

The National Grid covers England, Scotland, Wales and the Isle of Man (i.e. Great Britain). The Irish Grid covers the island of Ireland. Channel Islands use UTM grid.

IoM
Isle of Man Survey produces large scale mapping of Isle of Man (but 1:50,000 and smaller is by OSGB).
See the report of the Society visit to Isle of Man Survey in April 2008.
View Isle of Man mapping on-line

CI
In the Channel Islands, the surveying and production of mapping is undertaken under licence by Digimap Ltd.
See the report of the Society visit to Digimap in Guernsey in July 2009.
View Guernsey mapping on-line