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    Re: Mercator vs. Great Circle Charts
    From: Dave Weilacher
    Date: 2001 Aug 29, 7:13 AM

    So here are my answer to the test.  Please tell me where I've screwed up.
    
    
    Re: 1. Can true direction be determined in the same manner for all locations on a
    Re: Mercator chart? How about on a great circle chart?
    Re:
    
    Yes and Yes.  (Of course the 1st yes is supposed to be no on the test)
    
    
    
    Re: 2. How is the compass rose used on each of these charts?
    Re:
    
    Clueless.
    
    
    
    Re: 3. If I were to draw a straight line between two points (say Tokyo and Cabo
    Re: San Lucas) on both a Mercator chart and a great circle chart, would either
    Re: straight line represent a great circle?
    Re:
    
    Yes.
    
    
    
    Re: 4. Given the straight line drawn between Tokyo and Cabo San Lucas (see
    Re: above), which chart, the Mercator or the great circle, would give me the
    Re: shortest route between these two points?
    Re:
    
    Great circle.
    
    
    
    Re: 5. Would sailing a great circle course always be the best way to travel
    Re: across the ocean, or would ships have to take into consideration unfavorable
    Re: winds, currents, or storms that might cause a delay?
    Re:
    
    Not always for resons suggested plus land masses in the way.  Maybe even ice.
    
    
    
    Re: 6. Do most large ships today use computer assistance to help them choose the
    Re: best course across the ocean?
    Re:
    
    Yes.  (In a manner of speaking)
    
    ---------------------------
    Did I pass?
    
    --
    
    
    Dave Weilacher
    .USCG lic. 889968
    .ASA certifed sailing instructor 990800
    .AS400 RPG programmer
    
    
    
    _______________________________________________
    Get your free email from http://webmail.earthlink.net
    

       
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