Screen BacklightingThe GPS II’s backlight feature illuminates the screen display for a user-definedinterval (the default is 15 seconds) after every keystroke. There are three stages ofbacklighting. When backlighting is on, a bulb icon will appear at the bottom left ofthe sky view (Fig. 25). To adjust the duration of the screen backlighting, refer to theoperation setup section (see page 71).To turn the screen backlighting on:1. Press the red power key.2. Cycle through the three levels of backlight by pressing the red power key.To turn the screen backlighting off:1. Press the red power key.Whenever the GPS II’s backlighting is off, the bulb icon disappears from thesatellite status page.Fig. 25Note: Using the screen back-lighting can greatly reducebattery life. If you’re usingyour GPS primarily in day-light hours, you should keepthe backlight timeout at thedefault 15-second setting.REFERENCE25