What is the advantages of using your sensitivity button to get more or less gray area under the lake bottom.? I've learned that the gray area reprsents rock and the thin dark line represents a muddy or soft bottom.
C7

ideally, auto sensitivity will work just fine. sensitivity is really just for extreme depths. anything, say under 50 feet, will work with the sensitivity on auto, or 0 through +1 or 2.

You may have the white line feature disabled, this allows to you distinguish between rocks and stumps.

Thanks Josh,