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    DR vs EP vs MPP vs Fix vs Running fix
    From: Dave Weilacher
    Date: 2002 Feb 6, 07:53 -0500

    My definitions:
    
    DR - Position determined by heading, speed, known windage, and known (for sure) set & drift.
    
    EP - Position on an unsubstantiated line of position that you may be at.  
    Usually at the closest point of approach to DR.  It may also be where 2 or 
    more lines of position intersect, if you can't justify or explain the 
    difference between that position and your DR.  (this last comes out of 
    Bowditch 1977).
    
    MPP - Where you are most likely at.  Can be a DR, EP, running fix or fix. 
    Should be and probably is the place you are in the most danger (Murphy).
    
    Running fix.  Any fix determined by advancing or retiring LOP's. (No matter 
    how many)  Some folks argue that a running fix can only involve 2 LOP's.  
    (source ASA Coastal Nav text).  I can't justify the limitation
    
    Fix - The intersection of 2 or more lines of position or any other method that 
    you are absolutely sure of.
    
    
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