73REFERENCESetup Menu:SystemSet the ‘Backlight’ field to‘Always On’ to preventthe backlighting fromtiming out and turningoff automatically.‘Power Saver’ mode issuitable for most applica-tions and offers positionupdates which adapt toyour needs while savingbattery power.2. For simulated speed, user track, or altitude,highlight the desired field and press ENTER. Enterthe desired value using the rocker keypad andpress ENTER when finished.System SettingsBeeper lets you turn on or off an audiblebeep when any key is pressed or when anon-screen message appears to alert you toimportant information.Backlight lets you keep the screen backlight-ing on continuously (‘always on’) whenselected, or enable the automatic shutoff topreserve battery life. Automatic shutoff timesfrom 15 seconds to 4 minutes (since last keypress) are available.To set the backlight timeout:1. Highlight the ëBacklightí field and press ENTER.2. To keep backlighting on continuously, select ëAlwaysOní and press ENTER, OR3. To set a timeout duration, select the desired timeperiod and press ENTER.Battery is used to designate the type ofbatteries currently being used to power yourGPS 12 MAP: Alkaline, Lithium or NiCad.This setting ensures accurate readings fromthe battery gauge on the Satellite Status Page(see page 25).Power Saver is suitable for most applica-tions and offers position updates which adaptto your needs while extending battery life.The GPS 12 MAP will operate up to 36 hourswhen using Power Saver mode.To select power saver mode:1. Highlight the ëPower Saverí field and pressENTER.2. Use the UP/DOWN keys on the ROCKER KEYPADto select ëONí (or ëOFFí) and press ENTER.