FOREWORD 



This pamphlet on Loran, radiobeacons, microwave beacons, Radar re- 

 flectors, and Radar is published for the information of the United States mari- 

 time industry, commercial airlines and others interested in the application of 

 electronic navigational aids. It is intended to be of benefit to the industries 

 concerned in improving the safety, economy, and efficiency of transportation 

 over the areas of the world. 



The information has been prepared largely to answer many inquiries 

 received by the United States Coast Guard on these subjects. The Coast 

 Guard operates an extensive system of Loran and radiobeacon stations for the 

 protection of domestic and overseas transportation. Included in the pamphlet 

 are advisory minimum specifications for marine Radar, Loran receiving equip- 

 ment, and direction-finder equipment. These advisory specifications are 

 promulgated for the use of those interested in electronic navigational aid 

 equipment, and are intended only as a guide for voluntary use. 



Operational tests relating to electronic navigational aids for use by navi- 

 gators is undertaken by the Coast Guard as a normal function since its duties 

 include the saving of life and property at sea, maintaining and operating aids 

 to navigation, and merchant marine inspection. 



It is believed that this nontechnical treatment of the subjects presents 

 sufficient facts for an evaluation to be made in determining the benfits to be 

 derived in applying these equipments to the safeguarding of life and property 

 at sea. 



J- 



^<^^s.^ 



J. F. Farley, 

 Admiral, United States Coast Guard, 



Commandant. 



