A six-figure Grid Reference is generally used as the standard for biological recording, giving a location to within 100m. Landranger maps from Ordnance Survey which use a scale of 1:50,000 (or 2cm to 1km) are very useful. The 100km square(s) covered by the map have letter codes such as TF, TG, TL or TM: these are clearly printed in each corner. Each 10km square is further subdivided into one hundred 1km squares which are formed from blue grid lines, spaced 1km apart. The eastings are marked along the top and bottom edges of each map, and the northings down the sides. The convention for a six-figure Grid Reference is [2 grid letters] [3 figures easting] [ 3 figures northing]. For example, the six figure grid reference for Horning church is TG343174.
For further information on reading grid references, see below links:
Further information and a grid reference tutorial (Courtesy of Kent Biological Records Centre)
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