SMALL CRAFT, SHALLOW WATER ECHO SOUNDING INSTRUMENT 
Sketchs 
(To be provided) 
Primary Uses 
To be portable and to be utilized primarily by those small craft 
carried on board oceanographic survey ships for the purpose of conduct- 
ing detailed, controlled shallow water bathymetric surveys in con- 
tinental shelf areas and rivers throughout the world. 
Requirements and Specifications: 
ae To be portable and utilized primarily in those small boats and 
launches which are carried on board oceanographic survey ships. 
b. To perform reliably at boat/launch speeds of 0-12 knots and in 
water depths of 0-250 fathoms, with an accuracy at readout of +0.5 
fathom (3 feet) or better over the entire operating range. 
C.- Power Supply: 
(1) Should be capable of both AC and DC operation. 
(2) Should be equipped with a frequency meter and voltage re- 
gulator. 
d. Transducer(s): 
To include two (2) transducers of different frequency ranges, 
for the purpose of obtaining fine resolution of bottom detail as well as 
reliable performance under severe environmental conditions. These 
transducers are to be enclosed within the same streamlined housing. 
e. This system should include a streamlined housing for the dual 
transducer plus a streamlined sword-arm for supporting the transducer 
housing assembly. The transducer housing, the sword-arm, and associated 
support arms should be streamlined, light weight, of simple design, 
rugged, and easy to rig and unrig. Additionally, the entire assembly 
should be designed to permit installation on either side of the small 
craft/launch, at the bow or stern, and with a capability of positioning 
the transducer housing at any depth between 2-10 feet below the surface 
of the water. 
Ss 
