<Li> True bearing − variation = Magnetic bearing </Li> <Li> Magnetic bearing − deviation = Compass bearing . </Li> <P> These rules are often combined with the mnemonic "West is Best, East is least"; that is to say, add W declinations when going True headings to Magnetic Compass, and subtract E ones . </P> <P> Another simple way to remember which way to apply the correction for Continental USA is: </P>

West is the best east is the least