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    Re: Compass Checks at Sea
    From: Rob M
    Date: 2008 May 23, 10:09 -0700

    I was taught the old "two virgins make dull company, add whiskey" for
    TVMDC(AW).
    
    I would suggest that checking a compass at a pier or dock is not 'best
    practice' -- I think it was on this list I heard of the London City
    Airport magnetic anomalies set atop an old pier were extreme (OK for
    gyros, immune to magnetism)
    
    For the record, the best way to throw off your steering compass is to
    place a cell phone, hand held GPS, or Handheld VHF in a holder next to
    it. much more extreme errors than a can of drink!
    
    Rob
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