Two previous surveys had been made of the eastern portions of the Atoll. As stated in the Reconnaissance Report of January 7, 1949, these surveys were not readily adaptable to the requirements of this Project and were necessarily reoccupied to expand the present scheme. The U. S. S, BOWDITCH Survey, made in 1944, was of third order accuracy and covered only the eastern portion of the Atoll from Igurin to Bogombogo. (See Figure 5,8+-l for the U.S.S. BOWDITCH Survey tri- angulation net.) The apparent purpose was to make hydrographic charts of the Atoll. It included a base line on Runit Island, control points on eleven other islands, and a station in tne lagoon in the vicinity of the existing station Coral. The geographical position of station North Base on Runit Island and the azimuth of the base line between stations North Base and South Base were determined by astronomical observations. Because most of the stations of this survey were not on Project islands and because the reoccupation of the stations would have been necessary for system expansion, the values found in the U. S. 3. BOWDITCH Survey were not incorporated into the present survey, except in that the determination of the latitude and longitude of station Runit by the Joint Task Force Seven Survey was based on the original geographical position of station North Base as established by the U, S. S, BOWDITCH Survey. Also, the azimuth of the line Forth Base Sand was accepted from the U. S. S. BOWDITCH Survey. The Joint Task Force Seven Survey, made in 1947-48, and covering the eastern portion of the lagoon from Aniyaanii to Engebi, consisted of a limited scheme with stations on Engebi, Aomon, Runit, and Aniyaanii Islands, and station Coral in the lagoon. (See Figure 5.82 for the Joint Task Force Seven triangulation net) The scheme was stated to be of first order accuracy, and first order procedure had been used, How- ever, the base expansion figure was not consistent with specifications of the U. S. Coast and Geodetic Survey, and it was only because of the limited extent of the scheme that the work could be considered of a high order of accuracy. Of the seven stations included in the JIF-7 survey, station Graflex on Aomon Island had been destroyed, and the station on Aniyaanii was of little value in expanding the scheme. To establish a new station on Aoman required reoccupying three of the five remaining stations. It thus was apparent that the expanded requirements of the present survey involved re-establishment of a complete, triangulation network. (See Figure 5,8-3 for the H&N primary triangulation net, ) Station Seuth Base of the JU, S. S. BOWDITCH Survey was not recovered, and a new station "Runit® was established at the south end of the island. The line North Base-Runit became the base line of the H& N survey. The geographical position of station North Base and the azimuth of the line North Base-Sand as established by the U. S. 5S. BOWDITCH Survey were accepted and became the orgin of position and azimuth. Although 5-57