If you know the bounding geographic co-ordinates (OSGB) of your area of interest to the nearest km, please input them below. The format required is, for each box, a 3-figure number. If you have the two-letter code at the start of you grid reference, please convert it to numbers.

  (Letter to number conversion: Don't know how? - Click here.)

For example, the S-W corner of Britain is approximately 137 E, 026 N, to the nearest km.

If you selected the first or second option above, please ignore this section.

Maximum Values

N-E Corner of Area of Interest

East (Max) : 000
North (Max) : 000