To find this Multi cache you must find a green notice board to help you work out the coordinates.
The number you need is how many letters are in each word..
N51 A.BCD
A - 4th line last word
B - 2nd line 1st word
C - 3rd line last word
D - 1st line 3rd word
E0 E.FGH
E - 3rd line X2
F - 2nd line last word
G - 5th line last word
H - 5th line 2nd word