>> Missed the edit for the bit on magnetic variation.
>>
>> This you will find fascinating.
>>
>> tinyurl.com/y6yvxqbt
Interesting site.
I learned about magnetic/true/grid north at school and, with emphasis on using a map and compass to navigate, whilst in the Scouts and on school camp.
One or two members of the YHA group I joined in London c1981 were experts in this stuff and I had some real life mentoring getting from Y Garn over the Glyders and down to Llyn Ogwen at Easter 83. At that time we were assuming magnetic north to be about 6/6.5 degrees west of grid and reducing very slowly.
Magnetic north 2 degrees west of grid north didn't sound right.
Checking one of my older OS Maps, 1:50,000 First Series Sheet 186 (Aldershot & Guildford) dated 1974, states magnetic north as 8 degrees west of grid north decreasing by approx one quarter degree in 8 years.
Most recent OS map in my collection is OL234, Rutland Water; different scale to the above but that makes no difference here.
Dated 2016 it shows magnetic north 2.03 degrees east of grid reducing by 11minutes per annum.
Looks as though the rate of change is increasing rapidly.
How long until the runways at LHR are 08/26?
Last edited by: Bromptonaut on Mon 5 Oct 20 at 15:07
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