Posted on Feb 5, 2019
As Magnetic North Pole Zooms Toward Siberia, Scientists Update World Magnetic Model
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For navigation purposes also . air or ship there are an angle of correction between true North and Magnetic North and they do have to be updated otherwise over miles You will not be headed where You think without those charts. The larger the angle the further off course You will be if that isn't taken into account by very current charts and angle of correction
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SMSgt Lawrence McCarter
SFC (Join to see) - Their current charts would show the heading they need to take to be heading North as opposed to Magnetic North and as an example it may be 3 degrees West of the magnetic North so following magnetic North will have arrive at the wrong place. (the degrees will change as Magnetic North does shift as the geographic North doesn't)
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PO1 William "Chip" Nagel
SFC (Join to see) - There are Multiple "References" You can Use. A Compass is One. During My Time there was the Coast Guard Loran-C Coast Guard Radio Reference. Now there is the GPS Constellation but Nothing is "Perfect" The More Reference Points the Better though.
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SFC (Join to see)
SMSgt Lawrence McCarter - I understand how the magnetic declaration compensates and can convert a magnetic north reading to true north. The question in my mind is the magnetic north is a constant distance away from true north (ok moving very slowly), when a moving craft gets closer to the distance between magnetic and true north, and the distance between magnetic and true north remains constant: the angle of difference (magnetic declaration) will start to vary and increase or decrease. To my thinking that would create problems for navigation systems.
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SFC (Join to see)
PO1 William "Chip" Nagel - OK there are different systems that reference other factors. I can appreciate that.
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A lot of the maps I used in the Marine Corps had publication dates as far back as 1956! I spent time on several land nav courses and when the instructors did *NOT* walk the course beforehand we had an impossibly hard time finding the way-points. Even over 2 or 3 miles you could be off several hundred feet. In wooded terrain that meant you could not just eyeball the "marker".
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How often are the topo maps we use for land nav updated for correction factors? It's no wonder the "Butter" bar keeps getting lost.
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SMSgt Lawrence McCarter
One reason to use current information to account for the shifts that happen in magnetic North where geographic North doesn't change.
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