A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: Tony Oz
Date: 2017 Aug 29, 04:35 -0700
Dear John, thanks for the PDF!
Dear Tom and David, the link to the http://www.navworld.com/navcerebrations/mayday.htm from the https://en.wikipedia.org/wiki/Cessna_188_Pacific_rescue article is repeatedly dead for me (here in Russia).
I need some explanation on the "200 nm VHF circle" trick: was Cessna doing a small circle (where it was at the moment) to keep its 200 nm VHF receivability circle almost static while DC-10 flew through the circle to access its center (i.e. the Cessna) location? It was possible because: 1) Cessna had enough fuel remaining; 2) DC-10 is fast enough to cross the 400 nm in reasonably short time, right? The rest was to judge the chord length (the length the DC-10 covered till it lost the Cessna's VHF signal) to the 400 nm circle diameter, a trick similar to one used by Hipparchus and Ptolemy to access the "Sun's orbit" eccentricity and center location (by inequality of durations of four seasons), right?
Thank you in advance.