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    Re: Closest point of approach.
    From: Dan Allen
    Date: 2000 Aug 15, 4:36 PM

    I have found an analytical solution to this problem.
    
    See my web page at http://www.nwlink.com/~danallen/CPA.htm for a JavaScript 
    interactive calculator for solving the Closest Point of Approach problem.  
    View the source to see the underlying formulas.
    
    Dan Allen
    
    
    -----Original Message-----
    From  Navigation Mailing List
    [mailto:NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM]On Behalf Of Russell Sher
    Sent: Friday, August 11, 2000 7:09 AM
    To: NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM
    Subject: Closest point of approach.
    
    
    Does anyone know a simple way of calculating the closest point of approach
    between two vessels on given courses at given speeds?
    I would imagine that one method is to plot the courses and calculate which
    vessel will reach the point of intersection of the projected tracks first.
    The distance to the other vessel should give the CPA ( correct ?) There is
    no doubt a better method using the relative course - any input on this?
    I'm a bit suprisesd that few, if any, small-boat navigation books discuss
    this.
    
    regards
    Russell
    

       
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