Now, I would like to review a few of the engineering require- 

 ments and if I repeat some of the things that have been said before, 

 it is because these points need emphasis. 



Basically, oceanographic instruments must be durable. These 

 devices, in most cases, will be used for long periods and will be 

 used under relatively severe shipboard conditions so that durabil- 

 ity is an absolute must, for this is one of the most serious short- 

 comings of what we have available now. 



Throughout the design and manufacture of oceanographic 

 instrumentation components, inter changeability is a primary con- 

 cern because of the difficult logistical problems at sea. We have a 

 problem of having sensors and components which are not stan- 

 dardized and are not interchangeable. Each time we go out, 

 we need a whole new bag of devices rather than a relatively few 

 standard ones. In line with the requirements for present-day 

 oceanographic instruments, I would like to refer back to figure 

 8. 5 to re-emphasize some things that Captain Fusselman has 

 already said. 



The instrument suits of the Ships of Opportunity, the Synoptic 

 Ships, and the Survey Ships are relatively different. 



Accuracy: The Ships of Opportunity with their underway measure- 

 ments and the Synoptic Ships with their large number of measure- 

 ments require instruments of medium accuracy. The Survey 

 Ship, which carries a very high degree of specialized instrumenta- 

 tion, requires instruments of high accuracy. 



Mode of Operation: The Ship of Opportunity makes observations 

 only when underway; the Synoptic Ship and the Survey Ship can 

 be both underway and in a stopped position. 



Data Processing : There is no data processing on the Ship of 

 Opportunity; some is done on the Synoptic Ship; on the Survey 

 Ship data processing is extensive and is performed by computing 

 facilities . 



Data Volume: The Ships of Opportunity, because of their nature, 

 collect a moderate amount of information; the Synoptic Ship 

 requires large quantities of synoptic data; the Survey Ship 

 collects large quantities of information on station for long per- 

 iods of time. 



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