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Coriolis effect?
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<blockquote data-quote="MontanaRifleman" data-source="post: 894672" data-attributes="member: 11717"><p>It's not hard to figure magnetic declination if you know it and it's not hard to find out what it is in a particular area. Generally, East of the Missisppi you add to the magmetic heading to get true and West you subtract. Here in Montana it is bout 15* give or take.</p><p></p><p>A little googling will get you real close.</p><p></p><p><a href="https://www.google.com/search?q=magnetic+declination+map&client=firefox-a&hs=gmy&rls=org.mozilla:en-US:official&tbm=isch&source=iu&imgil=0kpSfLISQs5x6M%253A%253Bhttps%253A%252F%252Fencrypted-tbn2.gstatic.com%252Fimages%253Fq%253Dtbn%253AANd9GcTT6J76K2ReMzSR4Abe0Yqw7xND7OF0iYgjcRhy9gk3PLCMVhjL%253B677%253B578%253B9sGIzbtsuPp8mM%253Bhttp%25253A%25252F%25252Fwww.thecompassstore.com%25252Fdecvar.html&sa=X&ei=OYa2Ut7qEsaiyAHWk4CIBA&ved=0CDAQ9QEwAQ&biw=1157&bih=784#facrc=_&imgdii=_&imgrc=0kpSfLISQs5x6M%3A%3B9sGIzbtsuPp8mM%3Bhttp%253A%252F%252Flib.store.yahoo.net%252Flib%252Fthecompassstore%252Fdecmap2004.jpg%3Bhttp%253A%252F%252Fwww.thecompassstore.com%252Fdecvar.html%3B677%3B578" target="_blank">https://www.google.com/search?q=magnetic+declination+map&client=firefox-a&hs=gmy&rls=org.mozilla:en-US:official&tbm=isch&source=iu&imgil=0kpSfLISQs5x6M%3A%3Bhttps%3A%2F%2Fencrypted-tbn2.gstatic.com%2Fimages%3Fq%3Dtbn%3AANd9GcTT6J76K2ReMzSR4Abe0Yqw7xND7OF0iYgjcRhy9gk3PLCMVhjL%3B677%3B578%3B9sGIzbtsuPp8mM%3Bhttp%253A%252F%252Fwww.thecompassstore.com%252Fdecvar.html&sa=X&ei=OYa2Ut7qEsaiyAHWk4CIBA&ved=0CDAQ9QEwAQ&biw=1157&bih=784#facrc=_&imgdii=_&imgrc=0kpSfLISQs5x6M:;9sGIzbtsuPp8mM;http%3A%2F%2Flib.store.yahoo.net%2Flib%2Fthecompassstore%2Fdecmap2004.jpg;http%3A%2F%2Fwww.thecompassstore.com%2Fdecvar.html;677;578</a></p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 894672, member: 11717"] It's not hard to figure magnetic declination if you know it and it's not hard to find out what it is in a particular area. Generally, East of the Missisppi you add to the magmetic heading to get true and West you subtract. Here in Montana it is bout 15* give or take. A little googling will get you real close. [url]https://www.google.com/search?q=magnetic+declination+map&client=firefox-a&hs=gmy&rls=org.mozilla:en-US:official&tbm=isch&source=iu&imgil=0kpSfLISQs5x6M%253A%253Bhttps%253A%252F%252Fencrypted-tbn2.gstatic.com%252Fimages%253Fq%253Dtbn%253AANd9GcTT6J76K2ReMzSR4Abe0Yqw7xND7OF0iYgjcRhy9gk3PLCMVhjL%253B677%253B578%253B9sGIzbtsuPp8mM%253Bhttp%25253A%25252F%25252Fwww.thecompassstore.com%25252Fdecvar.html&sa=X&ei=OYa2Ut7qEsaiyAHWk4CIBA&ved=0CDAQ9QEwAQ&biw=1157&bih=784#facrc=_&imgdii=_&imgrc=0kpSfLISQs5x6M%3A%3B9sGIzbtsuPp8mM%3Bhttp%253A%252F%252Flib.store.yahoo.net%252Flib%252Fthecompassstore%252Fdecmap2004.jpg%3Bhttp%253A%252F%252Fwww.thecompassstore.com%252Fdecvar.html%3B677%3B578[/url] [/QUOTE]
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