Astronomic Operations. Astronomic operations were taken by the USS Bowditch at station North Base on Runit Island and the geographical position of that station and the azimith of a line between Station North Base and Station South Base were determined and used as the origin of the survey. This position and azimuth were accepted by the Joint Task Force Seven and became the origin of their later survey. Illustrative Plate 1 shows the layout of this network. Joint Task Force Seven Survey. A survey was made in 197-8 which estab- lished a control net of that portion of the Atoll east of Parry Island on the South of Engebi Island on the North. This survey is covered in the "Report of the Engineer, Joint Task Force Seven, Part Two." As station South Base of the previous survey which was the South end of the base line had been destroyed, a new base line approximately 2600 meters in length was established on Runit Island between station North Ease and a new station "Runit". This base was shorter than the former base line but was stated in the report to be of first order accuracy. No astronomic observations were made by this survey. Although the origi- nal azimuth observations were made from stations North Base to station South Base, an examination of the correction obtained for the angles in the adjustment of the Naval survey showed that little accuracy was lost by using the com- puted azimuth of the line from station North Base to station Sand. It was therefore considered that reobservation was unnecessary. In the computation of this scheme the latitude amd longitude of station North Base and the forward azimuth of the line from Station North Base to sta- tion Sand were accepted and together with the elements of the Clarke spheriod of 1866, used to determine the datum. An analysis of the report on this survey, together with information obe- Ite lL