Bring the compass rose variation up to date on older charts using this neat NOAA online calculator:
http://www.ngdc.noaa.gov/geomagmodels/struts/calcDeclination;jsessionid=9FF564BE66E2AD6825A25B5E4A3
Wednesday, August 5, 2009
Compass Rose Variation
Bring the compass rose variation up to date on older charts using this neat NOAA online calculator:
http://www.ngdc.noaa.gov/geomagmodels/struts/calcDeclination;jsessionid=9FF564BE66E2AD6825A25B5E4A3
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