Based in the North West English Region.
The SD50 10 square kilometre grid intersects with the settlements of Appley Bridge,Ashton-in-Makerfield,Bamfurlong,Billinge,Brownlow,Bryn Gates,Crank,Crawford,Crooke,Gathurst,Ince-in-Makerfield,Kings Moss,Land Gate,Longshaw,Orrell,Platt Bridge,Red Rock,Roby Mill,Shevington,Shevington Vale,Skelmersdale,Standish,Up Holland,Walthew Green,Wigan,Windy Arbour & Worthington.
SD50 is within the post towns of Skelmersdale, Lancashire, St. Helens, Lancashire & Wigan, Lancashire.
The square is within St. Helens District, West Lancashire District & Wigan District councils.
The SD50 national grid square measures 10 km by 10 km and has an area of 1,000 kilometres squared.
The technical term for a 10 km map square is a Hectad.
When this 10 km square is divided into a grid 10 by 10 it gives the next size of grid square. This unit is called a Monad and measures 1km square. 100 monads fit in a 10km square.
Out of the monads generated from square SD50, 426 are land and -326 are sea. Sea squares are disregarded on this site as they contain no land features.
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| Corner | Latitude | Longitude | Easting | Northing |
|---|---|---|---|---|
| South West Corner | 53.494331 | -2.756731 | 350000 | 400000 |
| South East Corner | 53.494331 | -2.604408 | 360000 | 400000 |
| North West Corner | 53.585066 | -2.756731 | 350000 | 410000 |
| North East Corner | 53.585066 | -2.604408 | 360000 | 410000 |