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    Great circle distance
    From: Zorbec Legras
    Date: 2000 May 23, 09:40 EDT

    Van: Frank Dinkelaar <frank.dinkelaar{at}XXX.XXX>
    Aan: NAVIGATION-L{at}XXX.XXX
    Onderwerp: Re: short horizon Hs correction
    Datum: din, 23 mei 2000 13:28
    cos D =  abs(sinL1 - sinL2) - abs(cosL1 x cosL2 x cos Dlo)
    why abs?
    look at this it comes from a time there was no Electonic calculators
    a= (sin l1 X sin l2)
     ==> sign of a is + l1 l2 same name / - diff name
    b= (cos l1 X cos l2 X cos Dlo)
    ==> sign of b is + if Dlo < 90?/ - if DLO > 90?
    cos D = a-b
    D in minutes of angle is the distance in Nm
    Pm if Dlo > 180? turn the ship!
    Cpt. Zorbec
    .
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