UK - OS maps change Mag North

[Herr-Berbunch]

Brits who've grown up using a map and compass correctly will have to rethink. They're getting rid of mag to grid. :03:

http://www.telegraph.co.uk/science/science-news/10585351/Ordnance-Survey-maps-to-change-as-magentic-north-heads-East-of-grid-north.html

[Lionclaw]

Did a little trigonometry. Although the article says less than 1°. I did use 1° at 1 000 metres.

tan 1°= x/1000

x is the distance 90° to the side by being 1° off in 1000 metres.

tan 1°= 0.017455

0.017455=x/1000 => 0,017455 * 1000=(x/1000) * 1000 => 0,017455 * 1000=x

0.017455 * 1000 = 17,455 [m]

[Herr-Berbunch]

I understand all of what you said.

http://24.media.tumblr.com/tumblr_ls9o9pWVV41r0ojhto1_500.gif

[Jimbuna]

Been a loooong time since I participated in fell walking and the kind....only use a sat nav now and then only on rare occasions.

[Lionclaw]

My notes.

http://imagizer.imageshack.us/v2/xq90/35/b9i7.jpg (https://imageshack.com/i/0zb9i7j)

[Herr-Berbunch]

British Geographical Survey has a handy little calculator. :D

Saves on the maths, and lessens the headache. :doh:

http://www.geomag.bgs.ac.uk/data_service/models_compass/gma_calc.html