Dont know if anyone else had heard this but at some point this month all compasses in Britain will point to true north not to magnetic north. It will be the first time this will have happened since the Royal Observatory started recording magnetic variation. And its reckoned that there will be no magnetic variation for between 10 and 20 years.
Not 'all compasses', just those close to the meridian; variation will still have a positive or negative value well east or west of the meridian in other parts of the UK.
Isogonals are shown on current aeronautical charts and are calculated in advance in 4 year periods called 'epochs'.
The Gruaniad (which of course I do not read) apparently reported it as zero declination rather than zero variation, declination being the vertical component of the magnetic field rather than the horizontal component.
That would not surprise me!!!!!!! Dont forget in 1884 the French voted against having GMT as the worlds time standard, they wanted Paris Mean Time as the world standard, and before anyone says anything PMT wasnt known about in Victorian days.
this link from Natural Resources Canda should amuse you all for a short while.
The virtual museum is worth a look as it shows some of the air survey stuff from
I suppose the following may explain why there is a government department dealing with this, magnetic north needs a lot of correcting for!
I tend to carry a compass in the vehicle but I have to own up I never used the thing on my trips to Labrador, must try harder next time. It also occurred to me that around Lab City and Fremont there is a lot of iron ore which probably makes using a compass tricky, some of the deposits are around 33% pure fe
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