Distinguish between a four figure grid reference system and a six grid reference system.
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A grid reference system is a simplified grid used for a map area to make reporting and looking up coordinates easier. In a grid reference system each grid line on the x axis and y axis is labelled sequentially with a two-digit number(much like a graph).
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A 6-figure grid reference contains 6 numbers which gives us an even more precise location inside the box given by the 4-figure number. ... The first two numbers are the easting, which is the same as in the 4-number grid. The third number represents how many tenths you need to move east from the easting value.
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