Furuno FSS-3BB, Operator'S Manual

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1. OPERATION
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1.13.4 Bottom discrimination mode
Bottom discrimination mode has two zoom ratios which can be set from the [Range]
section of the [System] menu. See section 4.7.1.
Bottom discrimination at 1/2 ratio
The left-side of the screen show the seabed as a straight line at approximately the
middle of the screen.
Bottom discrimination at 1/3 ratio
The left-side of the screen show the seabed as a straight line at approximately one
third of the screen-length from the screen bottom.
[Bottom discrimination 1/2]
displayed
Un-zoomed single
frequency displayed
Seabed echo tail length, seabed hardness
Long tail: Hard seabed (rock, gravel, etc.)
Short tail: Soft seabed (mud, sand, etc.)
[Bottom discrimination 1/3]
displayed
Un-zoomed single
frequency displayed
Seabed echo tail length, seabed hardness
Long tail: Hard seabed (rock, gravel, etc.)
Short tail: Soft seabed (mud, sand, etc.)