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Reference
Sonar Page
Sonar Page
The Sonar Page is where your GPSMAP 188/188C/238 Sounder becomes a powerful fi shfi nder/
fl asher. Fish are displayed as colored arches or as fi sh icons in three different sizes. Thermoclines are
shown as shades of blue. The area of strongest sonar return (or whiteline) is displayed as solid white.
Typically, the bottom will be the primary whiteline. A thin whiteline indicates a soft bottom while a
thick whiteline will follow the contour of the bottom and show any objects of reasonable size. For more
information on understanding sonar and the display, see page 14 and Appendix I.
Using the Adjustment Menu
The Adjustment Menu allows direct access to the settings and features most commonly used on the
Sonar Page. The currently selected option appears in the upper left of the display.
To select an adjustment option from the Sonar Page:
1. Press the ARROW KEYPAD LEFT/RIGHT to scroll through the options in the upper left of the
display, then press ENTER to access the desired option’s adjustment window.
OR:
1. Press MENU, highlight ‘Adjustments’ and press ENTER. A list of all options and their current set-
tings appears, with the selected option highlighted. Press UP/DOWN on the ARROW KEYPAD to
select the desired option and press ENTER to access the adjustment window.
To easily exit any of the adjustment options, press the QUIT key.
To change an Adjustment Menu setting:
1. Select an adjustment option to change using one of the two methods described above. The adjust-
ment window will automatically timeout and disappear when idle for 20 seconds.
2. Press the ARROW KEYPAD UP/DOWN to place the pointer or setting bar at the desired setting,
range or percentage (Off, 1-100%).
3. Press ENTER or QUIT to exit the adjustment window; or press LEFT/RIGHT on the ARROW
KEYPAD to view another adjustment window.
Sonar Page
Adjustment
Menu
Press MENU and
highlight ‘Adjustments’
to see a list of all options
and their current settings.
188188C238 Manual Part 1.indd 33 6/30/2003, 3:34:43 PM