PART VI: EVALUATION RESULTS FOR AVAILABLE EQUIPMENT 

 Introduction 



34. Brief evaluations for five commercially available sonar devices are 

 given in paragraphs 35 through 44. Keep in mind that the market and the tech- 

 nology are in flux. It is important to research the currently available sys- 

 tems before buying equipment, since the following is very brief and will soon 

 be out of date. 



EG&G Model 260 Image Correcting Digital SSS System 



35. The EC&G Model 260 is the state-of-the-art SSS. The authors have 

 direct experience using this system for typical coastal applications of the 

 type discussed in this report. The significant features of this system are: 



a. Automatic corrections for gain, speed variation, and slant 

 range . 



b. Compact and lightweight control unit. 



c. High image-quality dry paper display. 



d. Switchable towfish frequency (100 or 500 Khz) from onboard 

 unit. 



e. Survey speeds up to 12.7 knots (fastest available). 



f. Power from AC or optional DC; convenient to use battery power. 



£. Flexible for adding input from positioning system, etc. 



h. Digital cartridge -type data recorder available as an option. 



36. This equipment is a versatile tool for use in the coastal engineer- 

 ing field and is the authors' preferred system. 



KLEIN Model 590 Digital SSS 



37. The Klein Model 590 is the newest design from KLEIN incorporating 

 digital and microprocessor technology. The authors have used KLEIN SSS 

 systems for a number of years, although this newest model has been seen only 

 in a trade show setting. KLEIN equipment is more modular in format than the 

 EG&G system described in paragraphs 35 and 36; thus it is possible to 



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