4 GPSMAP 198C Sounder Owner’s ManualBASIC OPERATION > ADJUSTING THE BACK L IGHTThe Set Position,Track Control, Trackand Speed fieldsonly show while inSimulator Mode.To enter a simulated speed and heading from theMain Menu:1. Press MENU twice to show the Main Menu.2. Use the ROCKER to highlight the Systm tab, pressright then down until the field below the word Speed ishighlighted, then press ENTER.3. Use the ROCKER to enter a speed, and press ENTER.4. Use the ROCKER to highlight Track Control. PressENTER, and select a heading.5. Press ENTER to finish, and QUIT until you return to theMap Page.To adjust the simulated speed and heading from theCompass or Highway Pages:1. Press up on the ROCKER increase the speed in10 knot/kph/mph increments. Press down on the ROCKERto decrease the speed in the same increments.2. Press left and right on the ROCKER to steer the boat.Adjusting the BacklightThe Sounder’s adjustable screen backlighting is controlled with thePOWER key, and can be adjusted from any page.To adjust the backlighting:1. Press and release the POWER key. The adjustment sliderwindow appears.2. Press the POWER key again and the user-defined level ofbacklighting starts. You can adjust this level by pressing upor down on the ROCKER. If you press POWER one moretime, the backlight is at the maximum setting.3. Press ENTER or QUIT when finished.
