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>Difference between France and Quebec? ;-) I learned
>
>         Cv = Cc + W             (True = Magnetic + Variation)
>         W positive if East
>         W negative if W
>
>Fromn that one finds
>
>         Cc = Cv - W
>
>so that would say subtract too. (Le Cours de Navigation des Glenans, 1990,
>says "if the variation is East, it is substracted from the true heading".
>Also, when taking sightings, the sentence "Est-ce Plus ou Est-ce Moins (Est
>Plus, Ouest Moins)" is used to go from magnetic to true.)

CPS (both english and french) and USPS I think teach this mnemonic to remember:
West is Best (+),... East is least(-) going from True to Compass

>It is the first time I hear about East variation being considered negative,
>but this all arithmetic, right? Add the negative quantity, or substract the
>positive one, who cares?

Elementary my dear Watson!... ;-)
By convention:
 From compass to true East is + and West is -
and
 From true to compass West is + and East is -.

This being said:
That MLR GPS as gone "bezerk
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