![]() ![]() Now you have your 6 figure gird reference. To get the final figure (6) again repeat the above process, dividing the square in to tenths and estimate the number of tenths from the South edge to your location. This will give you the first 2 numbers of the second part of your 6 figure grid reference (numbers 4 & 5). These are the Northings, and tell you how far North/South you are. To obtain the second set of numbers repeat the above process, but use the South edge of your grid square in which you location lies and read the large 2 figure numbers opposite the end of your line in either the East or West Margin (plane taking off!). This has given you the third figure of the first part of a 6 figure grid reference. To get the third figure of the first part of the reference divide this 1km square up in to tenths, (every 4mm for a 1:25000 map, and every 2mm for a 1:50000 map) and estimate the number of tenths from the West edge of the square to your location and take note of this number. (A useful analogy to remember is the plane goes along the runway (read eastings first) before it takes off (then read Nothings)!) This will give you the first 2 figures of your grid reference. These are the Eastings, and tell you how far East/West you are. Take the west edge of the grid square in which your location lies and read the large 2 figure numbers opposite the end of the line in either the North or South margin first. One set to give you your East West fix and one set to give you your North South fix. When giving a grid reference it is imperative that these numbers are quoted in order to ensure the correct 100km area.Ī six figure grid reference consists of 2 groups of 3 numbers. This is shown in the Ordnance Survey (OS) map key and is also shown in the all of the corners of an OS map. (ie 1300k, or 13x 100km grid squares to cover the length of the country).Īs the grid numbering system repeats its self every 100km, each 100km area is given a unique 2 letter reference. In the same way the zero northing lies in the Channel, with and the 13 Northing lies North of Shetland. (ie 700km, or 7x 100km grid squares to cover the width of the country). The zero easting lies off the Western isles, and the 7 Easting lies in the North Sea. For mapping purposes the UK is divided up into 100km by 100km squares, this is the national grid system. ![]()
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