UK - OS maps change Mag North

Herr-Berbunch · 01-22-14, 03:22 AM

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

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.

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.

Herr-Berbunch · 01-22-14, 07:06 AM

British Geographical Survey has a handy little calculator.

Saves on the maths, and lessens the headache.

http://www.geomag.bgs.ac.uk/data_ser.../gma_calc.html

01-22-14, 03:22 AM	#1
Herr-Berbunch Kaiser Bill's batman Join Date: May 2010 Location: AN72 Posts: 13,203 Downloads: 76 Uploads: 0	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. http://www.telegraph.co.uk/science/s...rid-north.html __________________

01-22-14, 05:17 AM	#2
Lionclaw Ace of the Deep Join Date: Dec 2003 Posts: 1,006 Downloads: 5 Uploads: 0	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]

01-22-14, 05:36 AM	#3
Herr-Berbunch Kaiser Bill's batman Join Date: May 2010 Location: AN72 Posts: 13,203 Downloads: 76 Uploads: 0	I understand all of what you said. __________________

01-22-14, 06:42 AM	#4
Jimbuna Chief of the Boat Join Date: Feb 2006 Location: 250 metres below the surface Posts: 190,473 Downloads: 63 Uploads: 13	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. __________________ Wise men speak because they have something to say; Fools because they have to say something. Oh my God, not again!!

01-22-14, 07:06 AM	#6
Herr-Berbunch Kaiser Bill's batman Join Date: May 2010 Location: AN72 Posts: 13,203 Downloads: 76 Uploads: 0	British Geographical Survey has a handy little calculator. Saves on the maths, and lessens the headache. http://www.geomag.bgs.ac.uk/data_ser.../gma_calc.html __________________

01-22-14, 06:58 AM	#5
Lionclaw Ace of the Deep Join Date: Dec 2003 Posts: 1,006 Downloads: 5 Uploads: 0	My notes.