PART V - SUMMARY OF OPERATIONS (CONT) the vessel in a much more expeditious manner. The boilers and evaporator performed satisfactorily. Water hours or salt water showers did not have to be imposed and fresh water was taken aboard only at the Rodman Naval Base. The electrical plant performed satisfactorily. There was a major casualty to the voltage regulator on the No. 2 generator which could not be repaired by the ship's force. A spare was not on the allowance list. Procurement of a replacement from the U.S. was attempted but was unsuc- cessful. The difficulty was overcome for the duration of the cruise by jury rigging the regulator transformer on No. 1 generator so that it could be switched to serve whichever generator was on the line. The three ocean winches performed satisfactorily. There were failures but these were repaired without loss to the mission. One failure involving the new micromakton tow winch was directly attributable to faulty assembly at the time of construction. A set screw which secures the auxiliary drive sprocket to the keyway of the replenishment pump shaft had not been in- stalled. This permitted the sprocket to slide on the shaft causing the misalignment and ultimate failure of the chain drive which was driven by this sprocket. A replacement chain was not included in the spares provi- ded, so a temporary repair was affected by disassembling the chain and cannibalizing its component parts to fabricate a new chain of lesser width than the original. This repair served satisfactorily for the re- mainder of the cruise. o. Operations. (1) Navigation. While in the oceanographic survey area, three meth- ods of navigation were available, namely dead reckoning, the Omega system, and celestial. Omega was not useful because it demonstrated a position accuracy ranging from right-on to 25 miles off when cross-checked against accurate fixes obtained by other means. This was probably attributable to the lack of specially trained maintenance personnel as mentioned in section 4(b) above. Celestial navigation was the primary method used but due to a continual heavy cloud cover encountered in the operating area, position fixing had to be by opportunity rather than by a schedule. Con- sequently, ocean stations many times had to be made on the basis of dead reckoning with the best information on the actual position of the station not being established until several hours later. To insure that the position of record for any station was the one based on the best informa- tion regardless of when it was established, a ship prepared form, Enclo- sure 4, was utilized. One form was prepared for each station. It was initiated by the O.U.D. at the time the station was taken but it was not completed and released to the Oceanographic department until the naviga- tor had made his final determination of position and position accuracy. (2) MEDEVAC. On 12 September LTJG Terry W. BRAIN 7579, USCG became seriously ill with a space infection of a tooth. Medical advice was re- quested from the USNHS Hospital, Staten Island. They prescribed treat- ment and recommended early evacuation. This was not possible because ROCKAWAY was at the extreme offshore limit of the cruise. Four alterna- tives were available - treat the patient on board until arrival at the next port twelve days hence; proceed to the nearest land two days away (this was the Galapagos Islands where the medical facilities were quan- tonable); return to South America, a thousand miles away; transfer the patient to a shore-bound ship. All four alternatives were researched.