It is produced by the American firm of Hastings-Raydist, Inc. Two 

 types are available: a large 100- watt system having a range and 

 accuracy considered comparable with Lambda, and a miniaturized 

 10- watt system having a range to 25 nautical miles and high accuracy. 

 The miniaturized set has the great advantage of being truly porta*ble 

 and offers the solution for localized inshore surveys. The two systems, 

 large and miniaturized, are compatible so that they can be used 

 interchangeably. The large system has been used by both the Coast 

 and Geodetic Survey and the Hydrographic Office with satisfactory 

 results. The smaller system is not yet available for evaluation. 



4. Azimuthal systems 



No azimuthal systems are currently in use by the Hydrographic 

 Office. Consol is a European system of value only for navigation. 

 The Canadian microwave position fixing system has been evaluated 

 by the Coast and Geodetic Survey, but has not been tested by the 

 Hydrographic Office. No final report on this system has been received 

 yet from the Coast and Geodetic Survey. 



5. Composite systems 



Although no composite system generally is being used by the 

 Hydrographic Office, a combination of one hyperbolic line of position 

 and one Shoran station was established to control operations around 

 an island where insufficient distance was available to allow setting 

 up a Lorac net. Also available is a Raydist system which will do sub- 

 stantially the same thing with only two shore stations instead of three. 

 This system has not yet been evaluated by the Hydrographic Office. 



C. CONCLUSIONS AND RECOMMENDATIONS 



RDT&E funds have been requested for FY 1962 to accomplish work 

 on improved positioning methods and instruments. Some comments on 

 particular instruments are given below. 



1. Angle measuring instruments 



The optical instruments are well standardized, have good capa- 

 bilities, and are well adapted for the work. Even with the many changes 

 in survey techniques, it is considered that the various theodolites will 

 be hard to replace as mapping moves farther into remote areas. It 

 is expected that any changes in these instruments would be minor. 



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