By the end of the war, Lanks and B29s were bombing by radar image of the ground.. USN and RN had Airborne Radar effective enough to detect snorkels.. Just recently I learned that even the Japanese had an airborne surface search radar set.. By the time it was ready for use by IJN flying boats, it no longer mattered.. Wanna find the American Fleet??? There it is, right there, they ain't hidin no more, lol!