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Old 10-04-2016, 06:56 PM   #15
Wldrns's Avatar
Join Date: Nov 2004
Location: Western Adirondacks
Posts: 3,913
Originally Posted by geogymn View Post
Wldrns, I am going to start from point "A" and head straight to point "B" exactly 1 mile away. I forget to figure the 13% declination. After walking a mile by how my yards did I miss my target. Is there a simple mathematical equation or do you need a Trig. equation?
Technically it is a trigonometric problem, But for an easy rule of thumb(for relatively small angle errors), you will have approximately a 1 in 60 cross course distance displacement error for each degree of heading error. In other words, consider traveling 1 nautical mile (about 6,000 feet). one part in 60 of 6000 is 100, therefore you will be displaced from your goal by 100x13=1300 feet missing your target. in your case ( in this region of the country) you will be that much too far to the left of target if you have ignored magnetic declination.
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Last edited by Wldrns; 10-04-2016 at 11:02 PM..
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