Grid References
Go back to :ResourcesThis sheet is a quick guide to grid references. It should help
you when you are asked to find something on a map, such as a town,
or even an individual building. The grid lines on an Ordnance
Survey map are called eastings (along the corridor) and northings
(up the stairs).

Four-figure grid references
Each square has a grid reference which you get by putting together
the numbers of the easting and northing that cross in its bottom
left hand corner.

Six-figure grid references
In your head, you should be able to divide all sides of the square
into ten equal sections. By doing this, you can pinpoint locations
within the square - these are called six-figure grid
references.
Mag to grid get rid (Compass and Map)
Grid to Mag, Add (Compass and Map)
Along the corridor and up the stairs (Grid References)
Walk along the flat before flying upwards (Grid Refrences)
Using a grid card can be helpful we have a couple for borrowing perposes check out this link for more information http://www.where-wolf.com