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The Zoom function has seven settings:
No Zoom –– Displays the sonar picture with no zoom.
2x Split –– Shows two reduced-size sonar pictures at the same time. The right half of the display
screen shows the complete sonar picture at its original scale. The left half shows a portion of the
original picture at 1/2 depth scale.
2x Zoom –– Displays the 2x zoomed picture on the full screen and does not show the original scale
picture.
4x Split –– Shows two reduced pictures, the right at the original depth scale and the left at 1/4 the
original depth scale.
4x Zoom –– Displays only the 4x zoomed picture on the full screen.
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 fl at line across the
bottom of the screen, and returns are shown at their distance from the bottom up. 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 up) 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’ set-
ting is 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 is enabled to adjust how far off the bottom the unit displays data.
• Gain — controls the sensitivity of the unit’s receiver. This provides some fl exibility 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.
• Target Level — adjusts which colors (Fishfi nder 250C) or shades of gray (Fishfi nder 250) are used to
display sonar information. A Color Bar (see pg. 17) 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 (see pg. 11) displayed on
the Sonar Page. A lower percentage results in more weaker-signaled colors or shades (see pg. 11) displayed
on the Sonar Page. This setting does not increase/decrease the unit Gain.
2x Zoom
View
Normal View
Sonar 2x Split Screen
(shown with Depth Line)
Sonar View Adjustment
Bar
represents
area shown
on 2x View
Depth Line
Unit Operation
Adjustment Menu Options
250C Manual.indd 13 1/27/2004, 3:55:06 PM