
The Ordnance Survey (OS) is the national mapping agency for Great Britain and is one of the world`s largest producers of maps. It is a non-ministerial government department, executive agency and trading fund of the government of the United Kingdom, where it falls under the remit of the Department for Business, Innovation and Skills. It is also a ....
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http://en.wikipedia.org/wiki/Ordnance_Survey

(from the article `map`) ...beyond the means of private cartographers who had theretofore provided for most map needs. Originally exclusively military, national survey ... French progress in mapping stimulated the British to undertake a national survey. The Ordnance Survey was organized in 1791, and the first sheet ... [2 related art...
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http://www.britannica.com/eb/a-z/o/28

Britain's national mapping agency. It was formed for military purposes in the Napoleanic Wars (1790s-1810s AD). The Ordnance Survey is responsible for producing accurate maps, as places change. They frequently note archaeological and historical information.
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http://www.encyclo.co.uk/local/20766

formed in 1791 to undertake the first accurate national topographic survey of Britain. The work was carried out by The Honourable Board of Ordnance, part of the war office who were responsible for artillery, and therefore employed engineers - hence the name. They have provided accurate map co...
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http://www.encyclo.co.uk/local/20935

The Ordnance Survey is a British company producing maps of the British isles. The original work was carried out by the Royal Engineers under the direction of the Board of Ordnance and the survey was begun in 1747 for military purposes. The first map of Great Britain was ordered in 1797 and was published on a scale of 1 inch to the mile. In 1855 wit...
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http://www.probertencyclopaedia.com/browse/AO.HTM

[
n] - (United Kingdom) the official cartography agency of the British government
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http://www.webdictionary.co.uk/definition.php?query=Ordnance%20Survey
noun the official cartography agency of the British government
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https://www.encyclo.co.uk/local/20974

Initially part of the Ordnance Office and based at the Tower of London this department developed from the surveying activities of Royal Engineers and Corps of Military Surveyors in the eighteenth century until it was established as a government department
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https://www.encyclo.co.uk/local/22686
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