Chapter 3: System Setup 29When the Soft Keys option is set to OFF, the default soft keys are only displayedwhen a soft key is pressed and they disappear if no operation is performed for 10seconds.Key BeepThis option controls whether or not the keys sound a tone when you press them.MOB DataThis option controls whether MOB data is based on position data, or on deadreckoning (DR). Dead reckoning normally provides a better indication of thecourse to an object in the water, on the assumption that your boat and the objectare both subject to the same tide and wind effects.Autopilot Pop UpThis option controls whether or not the autopilot pop up is displayed. When set toON, when the status and locked heading of the autopilot changes, they aredisplayed in a pop up box. The box is removed from the display after two seconds.When Autopilot Pop set to OFF, the pop up box is disabled.Menu Timeout PeriodWith no timeout set, menus and soft key labels remain displayed until you clearthem by pressing ENTER, CLEAR or the appropriate dedicated key.If you set a value here, the menus and soft key labels are cleared if a key has notbeen pressed for the specified number of seconds.This setting does not affect the default soft key labels, which are controlled by theSoft Keys option (see above).UnitsYou can set the units for speed, depth, and temperature. The units you set will beused to display all data, including information received from other instruments onthe system. However, the distance units do not affect the instrumented range ofthe radar, which is always in nautical miles.Note:The ‘Units’ values set here are also used in the other display modes.