gate selectively, identify, and determine the bear- 

 ing of each buoy or capsule-mounted module. 



(Z) It shall operate from internal, non-spillable, re- 

 chargeable batteries. 



(3) It shall operate reliably over a temperature range 



of -25° to 50° C. 



(4) Maxinnum weight including batteries shall not 

 exceed 30 pounds. 



1.2000 VEHICLES. 



1.2100 TOWED VEHICLES. 



1.2110 Parameter Following Device (three models for 3 depth 

 ranges) . 



Purpose: To provide a vehicle that will follow constant 

 value of a given parameter, and carry special sensor 

 modules and other equipment. 

 Specifications ^nd requirements: 



This device is to be used on an electrically conducting 

 cable and will be towed from a vessel at speeds up to 

 15 knots. 



(1) Depth: 



(a) to 50 m. (8) 



(b) to 500 m (27) 



(c) to 2, 500 m (16) 



(2) The device shall contain any or all of the standard 

 or special sensor nnodules. Continuous surface 

 monitoring of the outputs of these modules is re- 

 quired. 



(3) The parameter being followed shall be selectable 

 from the surface. It shall also be possible to vary 

 the level of the parameter being followed within the 

 full range of the respective sensor module, pro- 

 viding the depth capability is not exceeded. 



For example, the device shall be capable of 

 following one tennperature level and upon command 

 from the sxirface proceed directly to any other 

 temperature level that the operator selects. It shall 

 then follow this new level. If the operator desires 

 to stop following the tennperature level, he may by 

 turning a switch command the device to follow any 

 other parameter for which there is a sensor 

 module. Similarly, the level of the new parameter 



428 



