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World Magnetic Model (WMM.COF)

Bluewater Racing uses U.S. NOAA's World Magnetic Model to compute magnetic declination at any point on the globe.  (Magnetic declination is the difference between true north and magnetic north.)  The model data is stored in the file WMM.COF. Since the magnetic poles are in constant (but slow) motion, the magnetic model is recalculated by NOAA every five years.  Each five-year period is referred to as an epoch. The current epoch spans January 1, 2010 to December 31, 2014

If you have downloaded a copy of Bluewater Racing at any time in the current epoch, you automatically have the most up-to-date version of WMM.COF.  If you downloaded a copy during a previous epoch, the program is probably complaining, and you should download the current WMM.COF into the top level Bluewater Racing directory.  (Under Windows, this is normally c:\Program Files\bluewater). You may also get a copy of the file directly from NOAA.


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