Preliminary Report EAC #13 San Francisco to Panama Canal 29 May to 12 June 1967 Survey Itinerary: 29 May 1300 Depart Treasure Island, San Francisco 30 May 0647 Enter Eastern Grid at Point "Ash" 31 May 0708 Depart Eastern Grid at Point "Oak" 12 June 1300 Arrive Panama Canal 13 June 1800 Depart Panama Canal 20 June 1200 Arrive Charleston, South Carolina Survey Personnel: Richard D. Chandler Support Vessel : USNS Shearwater TAG-177 Three separate preliminary reports have been prepared for EAC #13. Eastern Grid Survey #8 covering observations between Points A and O of the Eastern Grid; EAC #13 Caribbean and Atlantic portions briefly cover- ing observations from the Canal to Charleston, South Carolina; and this report, covering Pacific Ocean observations. Observations in the Eastern Grid area are also included in this report for the convenience of continuity. Methods: Aside from the fact that observation time was restricted due to the presence of only one observer, survey methods were similar to previousjerges. Diurnal observations ranging from one-half to two hours in dura- tion were scattered throughout the day as time permitted. Approximately 20 percent of the total diurnal mileage was spent logging observations. In addition to regular observations, cursory glances contributed to a oom picture of the avifauna and reports from various crewmembers, especially Captain Gibson, were helpful in filling in gaps. I feel that in a cruise of this "p水" nature where only the most general information is to be gained -- no more than a random one-third of the daylight hours need be spent logging observations. This is justifiably sufficient to allow the collected data to be significant. Above 50 percent logbook time, the returns are diminishing and for a one- or two-man scientific crew engaged in other associated work, inefficiency results. The survey area is a rough ESE course paralleling the eastern coast- line of the North Central Pacific Basin. The 3300-mile track covers 30ew degrees of latitude and 40 degrees of longitude (37°N, 122°W to 7°N, 82°W). See Figure 1. Over the 372 miles of regular diurnal observations -- 8517 birds of at least 30 species were recorded. Thirteen birds of 8 species were collected.