Introduction 13Press the multifunction knob to opena submenu with options for the inputor selection of numbers.Detailed description of the mobilephone portal functions 3 115.Basic operationMultifunction knobThe multifunction knob is the centralcontrol element for the menus.Turn the multifunction knob:■ to mark a menu option■ CD 300: to display a menu option■ to set a numeric valuePress the multifunction knob(Navi 600 / Navi 900: press the outerring):■ to select or activate the markedoption■ CD 300: to select or activate theoption displayed■ to confirm a set value■ to switch a system function on/offBACK buttonPress the BACK button briefly to:■ exit a menu■ return from a submenu to the nexthigher menu level■ delete the last character ina character sequencePress and hold the BACK button fora few seconds to delete the entireentry.Examples of menu operationNavi 600 / Navi 900Selecting an optionTurn the multifunction knob to movethe cursor (= coloured background) tothe desired option.Press the multifunction knob to selectthe marked option.SubmenusAn arrow on the right-hand edge ofthe menu indicates that afterselection of the option a submenuwith further options will be opened.Activating a settingTurn the multifunction knob to markthe desired setting.Press the multifunction knob toactivate the setting.