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    Re: checking the magnetic compass
    From: Antoine Cou�tte
    Date: 2009 Sep 24, 07:45 -0700

    On Aircraft too, Magnetic Compass is not dead at all, - if ever used to-day 
    though ... - and it remains as a HARD REQUIREMENT , unless you have for 
    example (B757/767) :
    - 3 independent Inertial Navigation Systems fully operational, or
    - 2 INS's fully operational and exclusively fly under positive ground radar 
    control throughout your flight,
    - AND provided Stand-by Magnetic Compass is repaired within 3 days at the most.
    This makes a hefty number of conditions ! Actually, most of the time, if not 
    always, all these very nice modern Navigation Systems are UP and work very 
    well !
    But, for Aircraft not having the same extensive Navigation Capabilities as do 
    current Medium/Long Haulers to-day, the "no stand-by magnetic compass" 
    situation equates to :
    "no standby Magnetic Compass, no Flite"
    (of course if you know it is down ... before flight),
    exactly as horseriders will say :
    "no foot, no horse" !
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