I am also thoroughly absorbed by the new TIGHAR TRACKS. What a body of work! Something I find intriguing is the last chart on the back of the book in the article by Bob Brandenburg on Tides & Credible Signals. It is interesting that credible transmissions apparently ceased at the start of the time zone of propeller clearance limit, with several hours of prime transmitting time still ahead. That suggests something drastic happened as a cut-off -- like the aircraft getting swept off the reef, to either float away or tumble down the submerged cliff. (Granted, there may be other explanations, such as running out of fuel to charge the transmitter.) After the aircraft was lost, there would be no reason to hang around the sweltering beach. The castaways might have a shell-shocked mental adjustment, watching their last link to possible rescue slide under the waves, that would impel them start searching the interior of the island in earnest to look for resources for long-term survival. No wonder they weren't seen by the search aircraft under that overgrowth canopy.