Go to the Ordnance Survey website (UK) and information on using a 6 figure grid reference can be found there.
Basically, the UK is covered in 100,000 metre grid squares. Each grid square is identified by two letters. These squares are further divided into 10,000 metre squares that are numbered along the map's borders. An example reference could be: SD 638365 The SD identifies the 100,000 metre square, the 63 is the vertical line to the west of the point. The 8 is the tenths from that line easterly to the point. The 36 is the horizontal line south of the point. The 5 is tenths northerly from the line to the point. (5 would be half way).
Instructions on taking grid references are printed on all Ordnance Survey Maps.
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depends on the map ................
you first ignore the last digit, and do the first 2 digits. then you split the small box into tenths. then do 2 figure grid ref on small box.
MGR4 (Map Grid Reference, 4) Four Grid Reference
The disadvantages of four figure grid references are 1 grid reference is 10 2 is 10 3 is 30 and 4 goes to 400..
Because it is much more accurate (long distances) Larger the figures the greater the accuracy- (very accurate)