Dave Billings said a while ago that he would conduct a new search in New Britain to find the aircraft wreckage reportedly seen by Corporal Angwin. As Billings has stated before, the consensus that AE and FN were 200 miles away from Howland Island "is based on the radio reception on that morning being “Strength 5″ and Bellart’s, the radioman on the USCG ITASCA, considered that because of this “S5″ value, the Electra was just about “right on top” of the ship. This is nonsense. “S5″ could be the reception from a transmitting station a thousand miles away. Even TIGHAR’s own radio gurus tell TIGHAR members that “S5″ does not mean she was close but even they are ignored." However, I would just reject Billings' criticism of the belief that AE really got close to Howland and stick to the assessment that AE didn't have enough fuel to make it to New Britain.
In one forgotten aspect of the New Britain hypothesis, Dave cites a radio message to support his belief that AE crashed in New Britain: "There is one radio call, which seemingly to other researchers, has no bearing on the matter. This is a radio call made public by the author, Fred Goerner, who found the item tucked away in a US Navy file. The call was made at 0030GMT and dated as 2nd July 1937. The call was, “Land in sight ahead….” and was only heard by the Nauru Radio operator who said that the voice sounded the same as the voice he had heard the night previous. The call time and date in the Eastern Hemisphere makes no sense as Earhart had departed Lae only one half hour before. The US Navy, however, would date the call in the Western Hemisphere and 2nd July is 3rd July in the Eastern Hemisphere. 0030GMT on the 3rd July is around 11:00am local time on Nauru. On my plot at that time, the Electra is within fifty miles of Banaba (Ocean) Island, on the way back." However, it's possible that this radio transmission was merely fraudulent because it was the only purported message that was picked up by the Nauru Radio Operator and a few people use this to support the belief that AE crashed her plane in the Marshall Islands.
Given the absence of any reports of civil aircraft crashing in New Britain before WW2 and the fact that no confirmed Model 10 Electras were lost in New Britain, it's possible that what Angwin saw in New Britain is merely a previously undiscovered bauxite mine in New Britain because I can find only one record of a plane that crashed in Papua New Guinea before WW2 (see
http://aviation-safety.net/database/dblist.php?Country=P2&lang=&page=2 for list), meaning that no civilian monoplane aircraft ever crashed in New Guinea before WW2.