NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
DR vs EP vs MPP vs Fix vs Running fix
From: Dave Weilacher
Date: 2002 Feb 6, 07:53 -0500
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. -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ .