Outcomes
        In this lesson you will 
        - describe the functional components of Sonar 
 
          - describe how sonar is used in specific applications
 
        
Prerequisites
        To be successful in this lesson, it would be helpful to know the following: 
        
        - pulse 
 
          - transducer 
 
          - echo 
 
          - Doppler shift 
 
          - propagate through a medium