Surface Radex. True bearings from ground zero 2409 clockwise to 50°; radial distance of 90 nmi (167 km) for H-hour to H+6, plus a circular radex around ground zero of 25 nmi (46 km) radius. It was recommended that the air control DDE (the USS Renshaw) move to a true bearing of 250° 90 nmi (167 km) from ground zero. Air Radex. For H+l, 10,000 feet (3.05 km) to about 40,000 feet (12.19 km), 280° clockwise to 75° bearings from ground zero, maximum distance 20 nmi (6.1 km); 40,000 feet (12.19 km) and up: 270° clockwise to 90° bearings from ground zero, maximum distance 35 nmi (65 km). For H+é6, multiply distances by six (210 nmi [389 kmj). On Enewetak, TG 7.2 radsafe officers were briefed, film badges issued, and couriers instructed on monitoring duties. Plans were made to muster all TG 7.2 personnel on the ocean side of Enewetak Island. The muster en- abled the personnel to witness the detonation at Bikini Atoll and served as a rehearsal for the type of muster to be performed if an evacuation were required. The P2V patrol squadron assigned to TG 7.3 and stationed at Kwajalein was directed to assume CASTLE radsafe monitor responsibilities for Kwajalein from H-hour to H+24 and to report radiation intensities in excess of 0.01 R/hr to the task force headquarters by Operational Immediate precedence. At Wake Island, TG 7.4 was directed to set up a special monitor station for the period H~hour to H+36. At the 1800 command briefing the observed and forecast wind patterns were completely favorable and the decision to shoot the following morning was confirmed. At approximately 2300, a directive was passed to CTG 7.4 on the cloud-tracking flights for the first 12-hour period on shot day. Two WB-29 cloud trackers were to operate in a racetrack holding pattern 50 nmi (93 km) west of ground zero, one at 10,000 feet (3.05 km), the other at approximately 5,000 feet (1.52 km). The directive specified a flight by Wilson 2 from H+2 to H+14 from base to a 3~hour holding pattern at 10,000 feet (3.05 km), and thence to a 500-nmi (926-km) radius sector with true bearings from ground zero of 60° and 90° at 10,000 feet 253 (3.05 km).