Humminbird 1197C SI - Manual (Page 61)

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ate interpretation of bottom contour and structure. For Side Imaging, the bottom composition determines the intensity of the sonar return. For example,
r relative density. Upward slopes that face the transducer reflect sonar better than downward slopes that face away from the transducer. You can find
or accurate interpretation of bottom contour and structure, including the following items:
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