HYDROGRAPHIC PRECISION SCANNING ECHO SOUNDER 
Sketchs 
(To be provided) 
Primary Uses 
For use on oceanographic survey ships in conducting underway pre- 
cision developmental (detailed) types of bathymetric surveys in deep 
oceanic areas. This instrument is needed to obtain a high resolution, 
stabilized, echo-sounding picture, including an automatically plotted 
contoured chart of the sea floor topography, extending a certain dis- 
tance (about 2 miles in 4,000 fathoms of water) perpendicular to and 
on each side of the ship's track. 
Requirements and Specifications: 
ae To perform reliably at ship's speeds of O to 18 knots and in 
sea states 0 through 5. 
be. Operating Depth Ranges 
(1) Automatic contour plotting (sweep width) O to 6,500 fathoms. 
(2) Single-ping and regular echo-gram recording operation 
O to 6,500 fathoms. 
ce Recording Accuracy: 1 fathom over full range of each scale. 
d. Transducer(s): 
(1) Types narrow beam, 1° to 3°, at the 10 db point. 
(2) Array: multiple series of transducers faired in to ship's 
hull, electronically stabilized, and so installed as to scan the sea 
floor for a specified distance on either side of the ship's track. 
(3) Transducer(s) should be located at a point along ship's 
hull so as to have minimum cavitation interference. 
(4) Should be capable of scanning up to 30° on either side of 
ship's track. 
(5) Should incorporate a feature for "plug-in" of a portable/ 
towed transducer. 
ee Stabilizers 
(1) Maximum stabilization angle of 60°. 
