Fishfinder 160C Owner’s Manual 3
GETTING STARTED > UNDERSTANDING THE FISHFINDER AND SONAR
Whiteline
The Fishfinder 160C can help you to determine if the bottom is hard
or soft. When the sonar sound waves are reflected back by the bottom,
a hard bottom returns a stronger signal than a soft bottom. A thin
whiteline indicates a softer bottom while a thick whiteline indicates
a harder bottom. Normally, a red line shows the point where water
meets the bottom. This line follows the bottom contour, along with
any significant objects lying on the bottom. The unit uses the whiteline
function to make the bottom layer information easier to distinguish.
With the Fishfinder 160C, active whiteline helps accentuate where
strong signals are located, which makes bottom type determination
easier. The example below shows the bottom return with and without
the whiteline activated.
Whiteline Turned Off
Hard Bottom
Whiteline
Soft Bottom
Thermoclines
Garmin’s See-Thru technology allows the Fishfinder 160C to “see”
through thermoclines and helps locate fish where they live; and fish
love thermoclines!
A rough definition of a thermocline is a break in water where the
water temperature changes faster than the water above it.
Thermocline
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General
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