2ADvANCED oPErATIoNSTrANSMIT PowErEach channel is programmed with either high or low transmitpower. On high transmit power channels, press the keyprogrammed as [Low Transmit Power] to change the transmitpower to low power (you cannot change low transmit powerchannels to use high power).• The indicator appears while using low transmit power.CAllING AlErTThe Calling Alert tone alerts party members that you aremaking a call. To make a call:1 Briefly press and hold the key programmed as[Calling Alert].• Release the key to end the tone transmission.2 Press the PTT switch and speak into the microphone inyour normal speaking voice.KEy loCKPress and hold the key programmed as [Key Lock] for 2seconds to lock the transceiver keys. Press and hold the [KeyLock] key again to unlock the keys.• “LOCKED” appears when a key is pressed while the keysare locked.Note: You can still use the following keys and functions when KeyLock is activated: [Emergency], [Lamp], [Monitor], [MonitorMomentary], [Squelch Off], [Squelch Off Momentary], [KeyLock], PTT.SEND THE GPS DATAPress this key when the GPS unit has been installed to sendyour positioning data to the base station.