How does Magnetic Variation effect the UK
Q. How and why does the Magnetic Variation effect the UK?
Also how can we employ this on map reading? Is it possible to recommend a good simple, easy book to read on the skill of map reading?
Damien Ayre, Belfast
Hope this helps
A. There is an excellent, free, variation and rate of change calculator available from this link
You need lat and long [for your position] - from your GPS or google.earth
Frankie Evans, Amble, Northumberland