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BASIC OPERATION > USING THE ADJUSTMENT MENU
18 Fishfinder 250/250C Owner’s Manual
Btm (Bottom) Split––shows two reduced pictures, the right
at the original depth scale and the left showing only sonar
returns close to the bottom. The bottom is displayed as a flat
line across the bottom of the screen, and returns are shown
at their distance from the bottom. You can adjust the scale of
the Bottom Split display by changing the Span setting (see
below).
Btm (Bottom) Lock––displays the Bottom Lock (returns
close to the bottom, shown at their distance from the bottom)
picture on the full screen. You can adjust the scale of the
Bottom Lock display by changing the Span setting (see
below).
• View/Span—available when a Zoom scale other than No
Zoom is selected. The View or Span settings are used to
change the viewing range of a zoomed display. The View
option is enabled when the display is set to 2x Split, 2x
Zoom, 4x Split, or 4x Zoom. If the display is 2x or 4x split,
only the zoomed portion on the left side of the display is
affected by the change. If the display is Bottom Split or
Bottom Lock, the Span option adjusts the area from the
bottom for which the unit displays data.
• Gain—controls the sensitivity of the unit’s receiver. This
provides some flexibility in what is seen on the display. To
see more detail, increase the receiver sensitivity by selecting
a higher gain percentage. If there is too much detail or if the
screen is cluttered, lowering the sensitivity may increase the
clarity of the display.
Sonar view adjustment
• Target Level—adjusts which colors (Fishfinder 250C) or
shades of gray (Fishfinder 250) are used to display sonar
information. A Color Bar (page 23) is displayed on the
right side of the screen as you adjust this setting. A higher
percentage results in more strong-signaled colors or shades
(page 15) displayed on the Sonar page. A lower percentage
results in more weaker-signaled colors or shades (page 15)
displayed on the Sonar page. This setting does not increase/
decrease the unit Gain.
• Whiteline—controls how the unit displays information about
the bottom type (hard or soft). When turned Off, all high-
intensity bottom returns are displayed as red on the Fishfinder
Bar
represents
area shown
on 2x view