Ys 
between there and Pearl Harbor. The REHOBOTH (NCO) will 
carry out oceanographic surveys in an, as yet, undetermined 
part of the Pacific to obtain environmental data for long 
range SONARS. Data will be collected on bottom reflect- 
ivity, bottom geologic structure and acoustic properties, 
bottom sediments and topography, plus observations and 
measurements with standard Nansen casts, sound velocimeter, 
and biological tows and trawls. Additional data will also 
be collected specifically for BuShips, but the exact nature 
and location of these data are not yet known. 
C. ATLANTIC OCEAN 
The SHELDRAKE and PREVAIL (NOO) will be alternated between 
hydrographic-acoustic surveys in the Bahamas and hydro- 
graphic-oceanographic surveys off the east coast of the 
United States. These latter surveys are directed towards 
filling holiday areas in the region west of a line between 
Newfoundland and the Barbados. The exact dates and areas 
of these surveys are not yet firm, but these operations 
will not be commenced until after the first of June. 
The LITTLEHALES (NOO) will conduct four surveys in 
the Bahamas area. On two of them, she will investigate 
(1) sound propagation conditions at selected locations 
and collect acoustic data on ambient noise variations as 
functions of sea state, depth, and wind speed, (2) diurnal 
variations in ambient noise from time-series stations, and 
