OCEAN ELECTRONIC NAVIGATIONAL AIDS 



51 



Figure 4-8. — Typical marine Radar equipment produced by United States manufacturers. 



(3) It indicates continuously instantaneous ranges and bearings of 



objects. 



(4) It presents a chartlike picture of the surroundings, the presentation 



being in the nature of a polar chart with PPI presentation. 



(5) By observation of the scope, movement of objects may be noticed. 



STUDY OF RADAR BY THE UNITED STATES COAST GUARD 



As the war progressed and the existence of Radar became known publicly, 

 the Coast Guard was approached by commercial ship operators with requests 

 as to how Radar could be used for commercial navigation. While the infor- 

 mation could not be released under wartime restrictions, the need for such a 

 study was realized and an extensive program to collect data was undertaken. 

 The United States Coast Guard cutter Mackinaw was Radar-equipped spe- 

 cifically for study of conditions on the Great Lakes. Additional ships and 

 planes were equipped and specialized personnel assigned for a study of condi- 

 tions on the Grand Banks during the 1945 Ice Patrol. Various harbor craft 

 were equipped and studies on the employment of Radar in harbors were made. 

 To coordinate activities a Radar study group whose sole purpose was to dis- 

 seminate existing information and accumulate new data was established at 

 Coast Guard Headquarters in the early part of 1945. The employment of 



