22Basic OperationCommunication5 Tap [START].The Down Timer starts.Tap [STOP] to pause timer if you want to stop it in themiddle.When the set time is reached, [00:00’00] appears in green.6 Press M shortly.Exits Timer Screen and returns to the previous screen.The ALTITUDE function for measuring altitude.The altitude of present location or change of altitude according to traveled distance canbe displayed as a graph.Precautionz In order to use the ALTITUDE function, connect the optional GPS antenna unit.z In order to display the ALTITUDE screen, set to [ALTITUDE:ON] of [DISPLAY] → [1 DISPAYSELECT] in the Top Menu beforehand.1 Press M shortly.Press M shortly a few times until ALTITUDE screen appears.2 Altitude appears.The present altitude appears on the display.Tapping [CLEAR] deletes accumulated data of altitude change.Tapping [LOCATION MEMORY] saves information on present location.3 Press M shortly.Press M shortly a few times until the screen returns to the previous one.Locking Keys and SwitchesOand switches can be locked to prevent accidental changes in radio frequency duringmovement.1 Press P shortly.[LOCK] appears on the display and the screen returns to the previous one.Reference To Unlock, press [PTT] shortly again.[UNLOCK] appears on the display and the screen will return to the previous one.Reference• Conditions for automatic Lock can be changed in the Setup Menu (See page 000).
