“Finally, there was the formidable difficulty of navigation. Making extraordinarily complex spherical trigonometry calculations based on figures taken from a crowd of instruments, navigators groped over thousands of miles of featureless ocean toward targets or destination islands that were blacked out at night, often only yards wide, and flat to the horizon. Even with all the instruments, the procedures could be comically primitive. “Each time I made a sextant calibration,” wrote navigator John Weller, “I would open the escape hatch on the flight deck and stand on my navigation desk and the radio operator’s desk while [the radioman] held on to my legs so I would not be sucked out of the plane.” At night, navigators sometimes resorted to following the stars, guiding their crews over the Pacific by means not so different from those used by ancient Polynesian mariners. In a storm or clouds, even that was impossible.”