The name dates back to World War II. Much of the mapping carried out during the war was done by the Department of Ordnance (the guys who take care of munitions, artillery, tanks etc.). Their maps then, were known as Ordnance Survey maps. Today, Ordnance Survey maps are carried out by civilian teams and have nothing to do with ordnance but the name has stuck.
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The Ordnance Survey is called so because it was originally created by the British government's Board of Ordnance in the 18th century to map out strategic locations and military defenses. The term "Ordnance" refers to military supplies, weapons, and artillery used by an army.
An OD (Ordnance Survey) map are maps that were originally used for the military. It was produced by following a series of surveys. Hope this helps. :)
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"Ch" on an Ordnance Survey map typically stands for "church." It marks the location of a church or a place of worship on the map.
It refers to a Pump or Pump house
An Ordnance Survey map is a topographic map produced by the national mapping agency of Great Britain. It provides detailed information about the landscape, including features such as relief, vegetation, roads, and buildings. Ordnance Survey maps are commonly used for navigation, outdoor activities, and urban planning.