NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Running fix course.
From: Byron Franklin
Date: 2009 Dec 22, 14:11 -0800
From: Byron Franklin
Date: 2009 Dec 22, 14:11 -0800
The running fix, certainly if other fact are know, they should be used. Estimates are not of certain, so should be closely monitored. I would use both TRF & ERF and DR., but pick the one closer to danger to watch. If course, speed or distance is known use it. An old way to find course, when three LOP�S are plotted from one NAVAID with out a change of speed or course (BRG. Time must be the same for each LOP.) Let�s use an idea known to all. This is the BOW-BEAM & QUARTER. This will work with any RFIX. WE don�t know it but we are heading NORTH or this could be relative brgs. Off the STBD bow @ 045 We plot 1st LOP. Off the beam will plot 2nd 090 LOP? Off the Quarter we plot 3rd 135 LOP. I think we all know the answer is distance run between bearings is distance off NAVAID at 090 Beam. No set and drift for this can problem. If we used a TRF we would have a tree pointer at LOP 135. Using the tree LOP�s, Let us find the course, we are on. We set the dividers at any spread larger than the distance between LOP 1 and LOP 2. We mark the LOP1 at the point of the divider (A) at LOP 2 we mark the other point (B). Using the same spread and parallel to (A&B) we place the dividers between LOP2 (C) & LOP3 (D.) A line drawn from A to D is your course. Your speed and distance is the only part left. -- NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList+@fer3.com