The National Grid system covers the UK with 100km grid squares.
Each 100km square
in Scotland, England and Wales is identified by 2 letters (e.g. SN) and
a single letter in Northern Ireland.
If we zoom into the 100km square H, you can see the grid that divides it again into 10km squares.
The lines that vertically run left to right (west to east) are called eastings because they are numbered from 0 to 9 progressing eastwards.
The grid lines
that run horizontally from bottom to top (south to north) are called northings
because they are numbered
Always read grid references by eastings first (left to right) and then northings. If you have trouble remembering think of along the hall and then up the stairs!
In the example shown the red square is H62.
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