Am I correct in thinking that:
OSX the 'Grid East Value' and
OSY the 'Grid North Value? in this context? O-)
Yes - if you look on the OSGB map included in the BSS glassary
http://www.sundialsoc.org.uk/glossary/ap11/ap11.htm
the 0-700km eastings and 0-1300km northings are noted up the sides.
I first found this form of grid reference used last year - at the end of the
Foot & Mouth crisis i downloaded a table of footpaths in the lake district
that were open , given as 12 figure references!
for example those in NX grid square were 3EEEee5NNNnn. ie what would
normally be NX EEENNN. Yes with enough digits they were quoted to the
nearest meter!
regards
Ian Maddocks
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