P2V aircraft swept the forecast fallout sector, using visual sigh ings and search radar out to 800 nmi km) on D-1l, and, (1,482 km) if necessary, in front of the cloud on D-day. Since the reliable range of the P2V search radar was taken as 30 to 50 nmi km), nmi (1, 1l on D-2, out to 600 nmi (56 the effective round-trip sweep width of a single P2V was 120 to (222 to 370 km). o 93 00 The P2V aircraft crews were instructed to repor shipping sighted in the D-2 sweeps and to attempt to divert ships sighted on D-1 and D-day. The area involved was huge, and a single (or even two or more) craft could search only a small portion of it. ai The search plan was m di- fied after BRAVO to search Area Green intensively with three P2V aircfaft on D-l, and to make a parallel search with two P2V aircraft out to 609 nmi (1,111 km) with a 240-nmi (444-km) sweep width centered on the foreca t direction of significant fallout. This procedure was expected to con; centrate the search effort in the areas where the maximum fallout wou! occur. The capability was also maintained, and used on some shots, t search on D-day in advance of the cloud. Another danger area (Evelyn was defined for the one shot at, Enewetak, NECTAR, to avoid excessive draig on aircraft availability owing to numerous shot cancellations. . Area Eve! yn ° was centered on Enewetak Lagoon, 270° clockwise through north to 90 , with a radius of 300 nmi (556 km), plus a rectangular strip 60 nmi (111 km and 600 nmi (1,111 km) long, immediately adjacent to the south. sine the upper airborne particle trajectories normally moved toward the east, smaller area could be searched faster time before H-hour) wide his (and therefore at a later start ng and with fewer aircraft, taking advantage of the ela- tively clear easternmost portion of the 450-nmi (833-km) danger zone out necessitating detailed searching. Figure 16 shows the locations £ these various areas. Fallout Prediction The Radsafe Office prepared the fallout predictions, delineated che danger zone and radex areas, and presented the predictions at command briefings before each shot. 108