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
The use of grid squares for the U.K. National Grid was introduced to reduce
the number of digits required to give a reference. E.g., for a place with full
National Grid coordinates 538857.2345 metres easting, and 177345.3456
metres northing (a position given to the nearest 0.1 millimetres --
Fellow Shadow Watchers,
While querying current magnetic variation at a UK location I was directed
to
The British Geological Survey Homepage which others might find useful.
http://www.geomag.bgs.ac.uk
Click on 'Navigation Models Charts'
Click on 'Grid Magnetic Angle Calculator'
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