Garmin Fishfinder 240 Blue Manuale d'uso - Pagina 41
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Whiteline
The Fishfi nder 160 Blue can help you to determine if the bottom is
hard or soft. When the sonar soundwaves are refl ected back by the bottom,
a hard bottom will return a stronger signal than a soft bottom. The stronger
the bottom return, the wider the bottom layer is displayed. The unit uses
the Whiteline function to make this bottom layer information easier to
distinguish.
When viewing the display without Whiteline active, the bottom return
is black. While you can make some determination of the bottom type,
the black return makes this more diffi cult. With the Whiteline active, the
bottom return appears layered in shades of gray and black, which makes
determining the bottom type easier and more reliable. Example 3 shows
the bottom return with and without the Whiteline activated.
Whiteline Turned Off
Hard
Bottom
Whiteline
Whiteline Activated
Example 3.
Understanding the Chart
Whiteline can also help you to determine the type of
bottom structure that is displayed on the chart. By
determining the hardness of the structure you can
make a better informed decision as to the type of
structure.
Soft
Bottom
Structure is hard, probably a
rock or stump
On the Water
On the Water
Structure is soft, probably a
mud pile
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