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    Re: A different variation tidbit
    From: Dave Weilacher
    Date: 2002 Feb 13, 14:22 -0500

    Yves;
    
    Did you monitor the discussion about variation and French made GPS?
    
    Do you know if variation (declination) is applied opposite in meaning in France vs elsewhere?
    
    
    Original Message:
    -----------------
    From: Yves Arrouye yves{at}REALNAMES.COM
    Date: Tue, 12 Feb 2002 21:39:16 -0800
    To: NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM
    Subject: [NAV-L] A different variation tidbit
    
    
    Still involving French and Bowditch...
    
    Bowditch (1995) says:
    
    Deviation: Angle between the magnetic meridian and the axis of a compass
    card, [...]
    Variation: Angle between the magnetic and geographic meridians at any place.
    
    And my French text book (Cours des Glenans, 1990) say:
    
    Declination: Angle between the magnetic and geographic meridians at any
    place.
    Deviation: Angle between the magnetic meridian and the axis of a compass
    card, [...]
    Variation: Sum of the declination and the deviation
    
    Interesting difference, using the same "variation" word, isn't it?
    http://www.geolab.nrcan.gc.ca/geomag/e_magdec.html mentions that marines use
    (magnetic) variation instead of magnetic declination.
    
    YA
    
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