INTRODUCTION TO SONAR 



lot at one time. Difficult or unfamiliar material 

 will require more study time. 



6. In studying any one unit — chapter, section, 

 or subsection — write down the questions that 

 occur to you. Many people find it helpful to 

 make a written outline of the unit as they study, 

 or at least to write down the important ideas. 



7. As you study, relate the information in 

 the training course to the knowledge you already 

 have. When you read about a process, a skill, 

 or a situation, try to see how tiiis information 

 ties in with your own past experience. 



8. When you have finished studying a unit, 

 take time out to see what you have learned. 

 Look back over your notes and questions. Maybe 

 some of your questions have been answered, 

 but perhaps you still have some that are not 

 answered. Without looking at the training course, 

 write down the main ideas that you have gotten 

 from studying this unit. Don't just quote the book. 

 If you can't give these ideas in your own words, 

 the chances are that you have not really mastered 

 the information. 



9. Use Enlisted Correspondence Courses 

 whenever you can. The correspondence courses 

 are based on Navy Training Courses or on other 

 appropriate texts. As mentioned before, com- 

 pletion of a mandatory Navy Training Course 

 can be accomplished by passing an Enlisted 

 Correspondence Course based on the Navy Train- 

 ing Course. You will probably find it helpful 

 to take other correspondence courses, as well 

 as those based on mandatory training courses. 

 Taking a correspondence course helps you to 

 master the information given in the training 

 course, and also helps you see how much you 

 have leEirned. 



10. Think of your future as you study Navy 

 Training Courses. You are working for advance- 

 ment to third class or second class right now, 

 but someday you will be working toward higher 

 rates. An3i;hing extra that you can learn now 

 will help you both now and later. 



SOURCES OF INFORMATION 



One of the most useful things you can learn 

 about a subject is how to find out more about it. 

 No single publication can give you all the in- 

 formation you need to perform the duties of your 

 rating. You should learn where to look for ac- 

 curate, authoritative, up-to-date information on 

 all subjects related to the military requirements 

 for advancement and the professional qualifi- 

 cations of your rating. 



Some of the publications described here are 

 subject to change or revision from time to time — 

 some at regular intervals, others as the need 

 arises. When using any publication that is sub- 

 ject to change or revision, be sure that you have 

 the effective (latest) edition. When using any 

 publication that is kept current by means of 

 changes, be sure you have a copy in which 

 all official changes have been made. Studying 

 canceled or obsolete information will not help 

 you to do your work or to advance in rating; 

 it is likely to be a waste of time, and may even 

 be seriously misleading. 



PUBLICATIONS 



In addition to the material presented in the 

 reading list at the front of this book, many 

 other publications are available for you to study 

 to further your knowledge and aid you in advance- 

 ment. Taking a correspondence course, for ex- 

 ample, is a very good method of learning a 

 subject. 



Other sources of information are the tech- 

 nical manuals for each piece of equipment. 

 These manuals usually are published by the 

 equipment manufacturer, and consist of several 

 sections giving a general description of the 

 equipment, installation and operation instruc- 

 tions, and preventive and corrective maintenance 

 procedures. 



Tactical doctrines, which also must be studied, 

 consist of Naval Warfare Publications (NWPs) 

 and Allied Tactical Publications (ATPs). Of 

 great interest to Sonar Technicians is NWP 24, 

 Antisubmarine Operations, which sets forth anti- 

 submarine doctrine and tactical instructions for 

 surface ships, aircraft, and submarines. Many 

 NWPs have supplements, known as Naval War- 

 fare Information Publications (NWIPs), which 

 give detailed technical instructions on how to 

 carry out the doctrine found in the NWP. Some 

 examples are: NWIP 24-1, Antisubmarine Classi- 

 fication Manual; and NWIP 23-8, Submarine Ap- 

 proach and Attack Manual. Also of interest is 

 ATP 1, Vol. I, Allied Naval Maneuvering In- 

 structions. 



TRAINING AIDS 



Most ships and stations carry a supply of 

 training films that are a valuable source of 

 supplementary information on many technical and 

 operational subjects. A selected list of train- 

 ing films is given in Appendix I to this training 

 course. Magnetic tapes also are available for 

 training in sound recognition, target classifica- 

 tion, and other aspects of sonar operations. 



