CONTENTS 



CHAPTER Page 



1. The sonar technician 1 



2. Submarines and antisubmarine units 9 



3. Bearings and motion 20 



4. Physics of sound 34 



5. Bathythermograph 57 



6. Principles of sonar 91 



7. Basic fire control 110 



8. Communications 132 



9. Maintenance 146 



10. Safety; test equipment; test methods 154 



APPENDIX 



I. Training film list 176 



INDEX 178 



