![]() ![]() six-figure grid reference, such as ‘192 454’, indicates a 100 m by 100 m square on the map.four-figure grid reference, such as ‘19 45’, indicates a 1 km by 1 km square on the map and.There are two main types of grid reference: The numbers going across the map from left to right are called eastings, and go up in value eastwards, and the numbers going up the map from bottom to top are called northings, because they go up in a northward direction. These squares are divided again into smaller squares by grid lines representing 10 km spacing each numbered 0 - 9. ![]() This then results in a series of 100 km squares There are four main first letters: ‘S’, ‘T’, ‘N’ and ‘H’ covering Great Britain, plus an ‘O’ square covering a tiny part of North Yorkshire that is usually below tide. The grid square which covers Cheshire is called "SJ". Each of these 500 km squares is then subdivided into a series of twenty-five 100 km by 100 km squares, again each with a letter of the alphabet A-Z (excluding I). The National Grid starts out as a series of twenty-five 500 km by 500 km squares, each given a letter of the alphabet from A-Z (missing out I). More detailed indexes are provided by the 1:63,360 sheets, on which each 10-kilometre grid line is emphasized, and by the 1:625,000 maps which are also gridded at 10-kilometre intervals.| Home | OS Grid Ref System | Paper maps | RODIS | GPS | Google Maps | DINTY | Apps | The number of each 1:10,560 sheet is linked to the number of its 'parent' 1:25,000 sheet: for example, if the 1:25,000 sheet number were TQ 47, the 1:10,560 sheet relating to its north-east quadrant would be TQ 47 NE. Each sheet of the National Grid 1:10,560 map, with sides representing five kilometres, depicts a quarter of the area shown on a 1:25,000 sheet. The numbering of National Grid maps derives from the numbering of sheets of the1:25,000 map, each of which is based on a ten-kilometre square. A note on the relationship between true, magnetic, and grid north appears in the south margin of the sheet, together with an explanation of how to give a National Grid reference correct to 100 metres, two panels of conventional signs, an index diagram to adjoining sheets, a 'survey diagram' where appropriate, giving the dates of survey of component larger scale sheets and, beneath, revision notes on other information on the map. Outer borders are graduated in scales of feet (west), yards (south), furlongs (east), and links and chains (north). All sheets also show latitude and longitude in association with the inner border abbreviated values are given at 1-minute intervals and full values, in degrees and minutes, accompanying the 1-minute interval nearest to the sheet corners. An inner border is divided at 100-kilometre intervals. Full grid values are given at the corners of each sheet, and the intervening values in kilometres, by the last two figures of the kilometre values from 00 to 99 inclusive. National Grid lines are shown at one-kilometre intervals. However, some sheets have an extended layout, especially where, as in coastal areas, this avoided the creation of sheets with large blank areas. It was originally intended that each sheet would represent a quadrant of a 10-kilometre square of the National Grid and so depict an area 5 x 5 kilometres. This series, however, contains a large number of Provisional Edition sheets: these are indicated in the catalogue. On publication of the Regular Series sheets, the corresponding Provisional Edition sheets were withdrawn. The Provisional Edition was not intended to be a definitive publication. As far as possible, the Provisional Edition incorporated revision undertaken between 19 at the 1:10,560 scale for the preparation of the Seventh Series one-inch (1:63,360) map. The sheets were produced by fitting the material of the County Series sheets, together with revision data, into the framework of the National Grid, with a minimum amount of redrawing. This map was designed to provide, as quickly as possible, an up-to-date map from the best available information. Ordnance Survey of Great Britain: Six-Inch Maps: National Gridīetween 19, a new edition of the six-inch (1:10,560) map began to be issued 'on National Sheet Lines'.Ī Provisional Edition of the 1:10,560 map on National Grid sheetlines was introduced in 1953. ![]()
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