OFFIC. The charts used for briefing pur-oses had te be of such sise to allow thee to be carried through the narrow ship passages and up ladders, and y6t large encugh for ths entire comand briefing group to read with ease. Due to the spliteetcll operation, and the eventual eetahlishment of the ca:< bility for firing at either atoll similtanecusly, some of the Radsafe brief—ing and display charte, files and pletting equipment had to be amenable to quick pacicing and ease of transport. As a conséquence, all. charts were mounted on 30° by 40" heavy carboard and covered with acetate. information was done with ching sartting pencils. Posting of For rapidly cilanging data, permanent records were made on separate emall forms during tlie progiess of the shot. The remainder of the data was transferred to permanent record charts or forms st the campletion of the shot. In general, the briefing and record displays used were as follows (a detailed description of each is given in Tab G)s ° (1) Briefing displays consisted of several polar charts for the display of all pertinent. observed end forecast hodographs and the surface RADEX, « chart (prepared by the Westher Central) for the forecast air particle trajectories, charts for fall-out plats for each of the methods in use for the shot, a ahart showing the danger and search areas together with pertinent contgeta made by search aircraft, a chart showing the transient shipping in and near the Danger ire, and 4 chart indicating the locations and pepulations of atolls in the general area. (2) Radsafe OFFICE record displays consisted of the sbove briefing charts plus the following: The Air RADEX, Cloud Tracking Operations chart, Shot-etoll radsafe situation plota, Off-site radsafe situation plots, and charts for the recording of radiation intensities on task force shipe, 76