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4 GPSMAP 188/188C Sounder Owner’s Manual
BASIC OPERATION > ADJUSTING THE BACKLIGHT
The Set Position,
Track Control, Track
and Speed fields
only show while in
Simulator Mode.
To enter a simulated speed and heading from the
Main Menu:
1. Press MENU twice to display the Main Menu.
2. Use the ROCKER to highlight the Systm tab, press
right then down until the field below the word Speed is
highlighted, then press ENTER.
3. Use the ROCKER to enter a speed, and press ENTER.
4. Use the ROCKER to highlight Track Control. Press
ENTER, and select a heading.
5. Press ENTER to finish, and QUIT until you return to the
Map Page.
To adjust the simulated speed and heading from the
Pointer or Highway Pages:
1. Press up on the ROCKER increase the speed in
10 knot/kph/mph increments. Press down on the ROCKER
to decrease the speed in the same increments.
2. Press left and right on the ROCKER to steer the boat.
Adjusting the Backlight
The Sounder’s adjustable screen backlighting is controlled with the
POWER key, and can be adjusted from any page.
To adjust the backlight:
1. Press and release the POWER key. The adjustment slider
window appears.
2. Press the POWER key again to start the user-defined
backlight level. To adjust this level, press up or down on
the ROCKER. If you press POWER one more time, the
backlight is at the maximum setting.
3. Press ENTER or QUIT when finished.