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Sonar Page Options
Reference
Noise Reject— helps filter unwanted noise from the graph. The ‘Noise Reject’ tool can be turned
‘Off’, set to ‘Normal’ (automatically adjusts for optimum viewing), or to a fixed 1-100% setting.
Increasing the Noise Reject setting decreases the sonars sensitivity. At high Noise Reject settings the
unit may not show all fish or structure. To turn the Noise Reject Off, press the ARROW KEYPAD
DOWN until the setting bar is all the way at the bottom of the range and reads “Off”.
Scroll— adjusts the rate that the graph scrolls from right to left. If you are sitting still or the graph is
moving too fast, slowing the scroll rate, or pausing it can be beneficial.
Sonar Page Options
The GPSMAP 178/178C Sounder’s Sonar Page features a menu page that provides access to addi-
tional functions and to layout and data field options.
To display the Sonar Page options:
1. Press MENU.
To select a menu option:
1. Use the ARROW KEYPAD to highlight the desired option and press ENTER.
The following options are available:
• Adjustments — lists the Adjustment Menu options and their current settings (see page 15).
To change an Adjustment setting:
1. On the Adjustment options list, use the ARROW KEYPAD to highlight the desired option and press
ENTER.
2. Use the ARROW KEYPAD to make the desired change and press ENTER.
• Show/Hide Pointer — allows you to reference sonar items and mark underwater waypoints. This
makes it easier to find and use an object such as a stump for a future fishing location. When using
this feature, the Sonar Page pauses. The pointer does not move off the paused display and cannot
show an area that has scrolled off the screen. The depth is updated while the display is paused, but
the unit does not show any new sonar data until the standard Sonar Page is resumed. You may see
a discontinuity from where the sonar information stops to where it starts again.
Depth Line
Adjustment
Noise Reject
Adjustment
Scroll
Adjustment
Sonar Page Menu Options