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2.3. Microphone
(1) UP and DOWN buttons These two buttons change the tuning channel.
The first scrolls upwards through the tuned marine channels, the second
scrolls downwards.
(2) Button 16
For ease of use, button 16 performs the same function as button 16 on the front
panel of the transceiver.
(3) PTT (push to talk)
Pressing this button will begin transmission.
(4) Microphone
During transmission, speak with the microphone a few inches away from your face.