42 GPSMAP 400/500 Series Owner’s ManualConfiguring the ChartplotterNOTE: You must be receiving NMEA sonar depth data or usinga Garmin sounder module to view depth and water temperatureinformation.Heading—sets the reference used in calculating headinginformation.• auto Magnetic—automatically sets the magnetic declination foryour location.• True—sets true north as the heading reference.• grid—sets grid north as the heading reference (000º).• User Magnetic—allows you to set the magnetic variation value.Position format—change the coordinate style in which a givenlocation reading appears. Do not change the position format unlessyou are using a map or chart that specifies a different positionformat.Map datum—change the coordinate system in which the map isstructured. Do not change the map datum unless you are using a mapor chart that specifies a different map datum.Time—set the time options.• Time format—select 12-hour, 24-hour, or UTC time format.• Time Zone—set the time zone you want displayed for timereadings. If auto is selected for the Time Zone, the DST optionis not available and is automatically set to auto.• dST (Daylight Saving Time)—select Off, On, or auto. Theauto setting automatically turns daylight saving time on or off,depending on the time of year.Changing the System LanguageTo change the system language, from the Home screen, selectConfigure > Preferences > Language and then select the language.Configuring Navigation PreferencesTo change navigation preferences, from the Home screen, selectConfigure > Preferences > Navigation.Route Labels—for saved routes, this determines whether routeturns are indicated by number (Turn 1, Turn 2, and so on) or bywaypoint name, or whether the description of turns is hidden.Turn Transition—set how much time or how far before a turn in aroute that you transition to the next leg.