Humminbird 300 SERIES 365I - Manual (Page 20)

10
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As the boat moves, the unit charts the changes in depth on the display to create
a profile of the Bottom Contour. The type of bottom can be determined from
the return charted on the display. A Hard Bottom such as compacted sediment
or flat rock appears as a thinner line across the display. A Soft Bottom such as
mud or sand appears as a thicker line across the display. Rocky Bottoms have
a broken, random appearance.
The sonar returns from the bottom, structure, and fish can be represented as
Inverse, Structure ID®, WhiteLine™, or Black (Bottom Black). See Sonar
X-Press™ Menu: Bottom View to set the bottom view.
Bottom Contour Profile with RTS Window™
Hard Bottom
Rocky Bottom
Soft Bottom
What’s on the Sonar Display