alasdair neill
New member
The other day put a couple of survey legs into the Mousehole & getting the magnetic variation from the BGS site resulted in a negative correction - is this a first for a cave survey in the UK?
see http://britgeopeople.blogspot.co.uk/2014/01/somethings-happening-to-magnetic-north.html
see http://britgeopeople.blogspot.co.uk/2014/01/somethings-happening-to-magnetic-north.html