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  1. The Ordnance Survey National Grid reference system (also known as British National Grid (BNG)) is a system of geographic grid references used in Great Britain, distinct from latitude and longitude. The Ordnance Survey (OS) devised the national grid reference system, and it is heavily used in their survey data, and in maps based on those surveys ...

  2. Topographic mapping in Canada was originally undertaken by many different agencies, with the Canadian Army’s Intelligence Branch forming a survey division to create a more standardized mapping system in 1904. The indexing system used today was established in 1923, and the map catalogue officially became the National Topographic System in 1926.

  3. Ordnance Survey Maps for Cumbria and the Lake District : Grid references are used for the locations of many places other than within towns. Each grid reference consists of a two letter code representing a 100 km square area, and two sets of 3 figure numbers.

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