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Adjusting the Sonar Page
Use the Adjustment Menu to access the settings and features most
commonly used on the Sonar Page. Ten main adjustment options
are available: Range, Zoom, View, Gain, Target Level, Whiteline,
Frequency, Depth Line, Noise Reject, and Scroll. The currently
selected option appears in the upper-left corner.
To select an adjustment option:
Use one of the following methods to select an adjustment option:
• Press the ROCKER right or left to scroll through the
adjustment options. When the adjustment option you want
appears, press ENTER.
• Press MENU, highlight Adjustments, and press ENTER.
Use the ROCKER to highlight the adjustment and press
ENTER.
After you select an adjustment option, press the ROCKER up or
down to change the setting.
You can also press MENU and highlight a shortcut setting to
quickly change to commonly used settings and values.
Press ENTER to accept the new setting (or press QUIT to cancel)
and return to the Sonar Page.
Sonar Adjustment Options
Scroll—adjusts the rate that the sonar display scrolls from right to
left. If you are sitting still or the sonar display is moving too fast,
slow the scroll rate or pause the scrolling.
Range—sets the display depth range used for viewing. The unit can
be set to automatically track the bottom or set to a user-specied
depth range.
Zoom—allows you to quickly select a display zoom scale or to
split the display. When a scale other than No Zoom is selected, the
Adjustment Menu shows a new selection labeled View or Span. The
Zoom function is divided into six levels:
•
2X Split—shows two reduced-size sonar pictures at the same
time. The right half of the 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.
GPSMAP 378/478 Owner’s Manual 105
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