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    Re: leg 60
    From: Dan Hogan
    Date: 2000 Mar 23, 2:00 PM

    R.:
    
    ># 2. Distance 88.5 nm
    ># 3.  190d t
    >
    >But I cheated and I am somewhat confused by my answers.  I used a
    >program entered into my TI 60 calculator for determining Hc and Z.  I
    >computed lha by the difference between my lat and the long. of the
    >waypoint.  I entered my lat and substituting  the lat for the waypoint for
    >dec in the program. Then I checked my calculations using the Nav20 program
    >in the archive.
    
    I haven't used either Nav20 or a TI. But to get the correct answer you
    need to use one of the Sailings for a solution. Using  Sight Reduction
    provides a Great Circle answer.
    
    >My question is this.  The program calculates Hc which is in degrees
    >between the assumed position and the gp of the body (in this case it
    >would be the waypoint. Since 1 degree equals 60 nm the calculated
    >distance should have been 60 X the degrees arrived at from the
    >calculation or 5310 nm.  How  did Nav 20 come up with 88.5 nm?
    
    Real quick to use an SR program for GC use:
    
    Latitude of Departure
    Latitude of Destination
    LHA= diff in longitude between departure point and destination
    Az= TC
    GC distance  = 90 - Hc x 60
    
    Distances will vary depending on the formula used for the SR.
    
    
    
    
    
    Dan Hogan WA6PBY
    C27 "Gacha"
    dhhogan{at}nav.cnchost.com
    Navigation-L: http://nav.cnchost.com
    

       
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