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2
The Fishfinder 240 can also help determine if the bottom is
hard or soft. When the soundwaves are reflected back by the
bottom, a hard bottom will return a stronger signal than a soft
bottom. The stronger bottom return results in a wider visible
bottom layer than the soft bottom. The Fishfinder 240 uses the
whiteline function to make this information easier to distin-
guish. When viewing the display without the whiteline activat-
ed, the bottom return is black. While you can determine the
bottom type, the black return makes this more difficult. With
the whiteline active the bottom return appears layered in
shades of gray and black. These make determining the bottom
type easier and more reliable. Example 3 shows the bottom
return with and without the whiteline activated.
On the Water
DETERMINING THE BOTTOM TYPE
Example 3.
