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Humminbird SI Sensitivity setting

little fish's picture

By little fish - Posted on 12 January 2011

Ray I have been playing with the sensitivity settings on my 798 and I can not figure it out. What is the best sensitivity setting for Side imaging with the Humminbird 798?

Ray's picture

Hey Bud. The sensitivity is an adjustment of the dark and light colors and the easiest way is to adjust until you get a good contrast between bottom hardness. If you adjust too high it will cause more bright white areas and make it hard to see fish, to little and the image will be darker. I like to adjust per bottom hardness - mud bottoms require a little higher sensitivity and hard bottom reduce the sensitivity to give you good separation of the hardness. For beginners the factory default will work for most all applications. The best way to adjust is to hit the 4Way cursor which stops the screen from scrolling adjust contrast to your best viewing.


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A distinct layer of water where rising warm and sinking cold water meet but do not mix. It is a layer of water where the temperature changes at least one-half a degree per foot of depth. In many of our desert bass lakes, a thermocline often develops during the spring and breaks down in the fall. The colder layer of water is often lacking in oxygen, forcing most baitfish and sport-fish to the upper layer of water. Thermoclines can be so dense that they actually show up on sonar (fish finders and depth finders) as a thick, impenetrable line.

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