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Check your compasses
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05-09-2019, 05:47 PM
Sunfish
(Ray)
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Join Date: Mar 2018
Location: Wollongong
Posts: 1,909
Better still , you can go here and get a magnetic variation for any place at any time in the past. Handy if you have some old survey information in magnetic coordinates.
http://www.ga.gov.au/oracle/geomag/agrfform.jsp
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