Seize the day

SLV Example Image 2

Notice the gradually decreasing sensitivity of the record as it is played back on the Lowrance Sonar Viewer.  This record, taken off Santa Catalina Island with an LCX-15MT, shows schools of fish.
 
Santa Catalina record sensitivity adjusted 1 Santa Catalina record sensitivity adjusted 2
Santa Catalina record sensitivity adjusted 3 Santa Catalina record sensitivity adjusted 4