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Map Reading Techniques (Tutorial)
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Nik - KOTM
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Joined: 26 Mar 2005
Posts: 2508
Location: Somewhere over the rainbow

PostPosted: Mon Oct 29, 2007 6:47 am    Post subject: Reply with quote

Quote:
To compound matters, the earth's magnetic field doesn't run straight north-south, either. In some parts of the world the deviance can be 30 degrees! Any decent topographical map will tell you the magnetic deviation, the year the map was printed and the annual change in deviation


I'll give you another one too - for some reason the Earths Magnetic poles will flip over - South becomes North and North becomes South - but fortunately this is highly unlikely to affect us in our life time
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martynj
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PostPosted: Sun Feb 22, 2009 7:11 pm    Post subject: Add degrees or take them away....which one is it? Reply with quote

Hi All,

I was told an easy way to remember whether to add or subtract the deviation by a yatchy friend:

If your taking a bearing by sight to transfer to the map - take the bearing, then go down to the map (or chart Wink), down means less so take the deviation away. If your taking a bearing from the map to sight, up from the map so add the deviation on.

Hope this helps a little.

MJ
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foxy
Trekker
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Joined: 25 Nov 2007
Posts: 298
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PostPosted: Sun Feb 22, 2009 8:23 pm    Post subject: Reply with quote

Similar to how I teach it - little world (map) to big world (ground) -add, and vice versa Wink
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