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British national grid reference system: Quiz


Question 1: In ________ the WGS 84 longitude lines are about 70 metres east of their OSGB 36 equivalents, this value rising gradually to about 120 m east on the east coast of East Anglia.

Question 2: OSGB 36 was also used by Admiralty ________ until 2000[citation needed] after which WGS 84 has been used.
Map projectionNautical chartCartographyMap

Question 3: Note that 13 digits may be required for locations in ________ and further north.

Question 4: For example, the grid reference of the 100 m square containing the summit of ________ is NN 166 712.
Ben AlderChno DeargBinnein MòrBen Nevis

Question 5: Theoretically, the system extends far over the ________ and well into Western Europe with square AA near Iceland and square ZZ in northern Italy.
Atlantic OceanPacific OceanArctic OceanIndian Ocean

Question 6: The ________ (OS) devised the national grid reference system, and it is heavily used in their survey data, and in maps (whether published by the Ordnance Survey or commercial map producers) based on those surveys.
EnglandDepartment for Communities and Local GovernmentUnited KingdomOrdnance Survey

Question 7: The WGS 84 latitude lines are about 70 m south of the OSGB 36 lines in South ________, the difference diminishing to zero in the Scottish Borders, and then increasing to about 50 m north on the north coast of Scotland.

Question 8: Grid references are also commonly quoted in other publications and data sources, such as guide books or ________ planning documents.

Question 9: The grid is based on the OSGB36 datum (Ordnance Survey Great Britain 1936, based on the Airy 1830 ________), and was introduced after the retriangulation of 1936–1962.
EllipsoidOblate spheroidEllipseLatitude

Question 10: The longitude and ________ positions on OSGB 36 are the same as for WGS 84 at a point in the Atlantic Ocean well to the west of Great Britain.
Prime MeridianLatitudeAntarctic CircleEquator


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