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Explanation of the UK National Grid

The National Grid is a map reference system covering Great Britain, but not Ireland or the Channel Islands. The X/Y (East/North) axis 0/0 point is south west of Lands End.

Alphabetic 2 letter codes identify 100 Km squares, which subdivide into 10 Km squares numbered 0 to 9 West to East and South to North from the left corner. Eastings are quoted before Northings.

Coordinates of 372.8 East and 168.2 North, would be expressed at increasing accuracy as: ST the prime 100 Km square ie 3-- 1--
ST76 a 10 Km square ie 37- 16-
ST7268 integer coordinates ie 372 168
ST728682 coordinates of 372.8 168.2.

UK 100 Km National Grid squares

1300         HP    
1200       HT HU    
1100       HY HZ    
1000 NA NB NC ND      
900 NF NG NH NJ NK    
800 NL NM NN NO      
700   NR NS NT NU    
600   NW NX NY NZ    
500     SC SD SE TA  
400     SH SJ SK TF TG
300   SM SN SO SP TL TM
200   SR SS ST SU TQ TR
100 SV SW SX SY SZ TV  
0 100 200 300 400 500 600  

 


Evox Facilities Ltd, 9 Hillbrow, Reigate Road, Reigate, Surrey, RH2 0QX England
Tel/Fax: +044 (0)1737 247333