The two PBY's on the 1956/57 survey were CF-IJJ and CF-IGJ, operated by Kenting Aviation. I had the good fortune to meet the Captain of IGJ, Bob Pettus, ten years later in 1966. At that time Bob was still flying the PBY, for Austin Airways, the same machine that is now ZK-PBY of the New Zealand PBY Historical Society. The other survey Captain was an Englishman named Gavin Robertson.