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Herr-Berbunch

01-22-14 03:22 AM

UK - OS maps change Mag North

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/s...rid-north.html

Lionclaw

01-22-14 05:17 AM

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

Code:

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

01-22-14 05:36 AM

I understand all of what you said.

http://24.media.tumblr.com/tumblr_ls...ojhto1_500.gif

Jimbuna

01-22-14 06:42 AM

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

01-22-14 06:58 AM

My notes.

http://imagizer.imageshack.us/v2/xq90/35/b9i7.jpg

Herr-Berbunch

01-22-14 07:06 AM

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_ser.../gma_calc.html

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