Humminbird 3004 用户手册

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Thermocline is a temperature change at a certain depth in the water. In some conditions 
the sonar waves will actually reflect or bounce off this temperature change and therefore it will be 
displayed on the LCR as shown above. To see the thermocline, you will need to go to the manual 
mode and increase the sensitivity setting. 
 
 
One of the best ways to learn to use your LCR is to go over familiar locations. If you know 
what's under the water and can see it displayed on the LCR, then you're on your way toward 
gaining the experience you need.