View/Span; Gain; Target Level - Garmin Fishfinder 320C Owner's Manual And Reference Manual

The Zoom function is divided into six display levels:
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 sonar returns from the bottom up. All target depths will read as a distance from the
bottom.
Btm (Bottom) Lock –– Displays only the Bottom Lock (returns from the bottom up) picture on the
full screen.
• View/Span — available when a Zoom scale other than 'No Zoom' is selected. The 'View' or 'Span'
setting is used to change the viewing range of a zoomed display. If the display is 2X or 4X split, only the
zoomed portion on the left side of the display will be affected by the change. If the display is Bottom Split or
Bottom Lock, 'Span' will adjust how far off the bottom the unit will display data.
• Gain — allows you to control 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 are used to display sonar information. A Color Bar (see pg.
16) will appear on the right side of the screen as you adjust this setting. A higher percentage will result in
more strong-signaled colors (see pg. 9) displayed on the Sonar Page. A lower percentage will result in more
weaker-signaled colors (see pg. 9) displayed on the Sonar Page. This setting does not increase/decrease the
unit Gain.
Unit Operation
Adjustment Menu Options
2X Zoom View
Sonar 2X Split Screen
(shown with Depth Line)
Sonar View Adjustment
Depth Line
Normal View
Bar
represents area
shown on 2X
View
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