10 km grid square map
Topographical map grids are worked out in metres, with the grid lines being 1, metres apart. , maps are divided into squares representing 1 km 2, each square on the map being one square centimetre in area and representing 1 km 2 on the surface of the earth.; For , maps, the grid lines are 2 cm apart. These squares are divided into smaller squares by grid lines representing 10 km spacing each numbered 0 - 9, from the south-west corner in an easterly and northerly direction. You can thus identify a 10km grid square by quoting two grid letters and the eastings and northings; for example, TQ 6 3. When the term 'grid square' is used, it can refer to a square with a side length of 10 km, 1 km, m, 10 m or 1 m, depending on the precision of the coordinates provided. A grid system overlays a rectangular grid on the map, to which points are referred instead of using longitude and latitude. The earth between 80°S and 80°N is divided.