Raymarine Ray54 - Manual (Page 21)

Chapter 3: Getting Started 11
Microphone
1. PTT
Press this Push-to-Talk key to transmit.
2. UP/DOWN
Use the arrow keys to change the active channel number. Press and hold for
rapid channel changing. You can also use these keys to scroll through DSC
Call and Menu Mode options and make item selections.
3. 16/9
Use this key to switch to the priority channel or to change the value of the
Secondary Priority Channel.
4. HILO
Use this key to toggle the transmit power from HIGH to LOW. You can also
use it to accept DSC Call and Menu Mode selections.
Main Unit
5. CH
Rotate this knob to change the current channel number and to change values
in Menu mode or during programming. Press the knob to enter values
selected in Menu mode or during programming.
6. PWR/VOL
Use this knob to turn the radio ON and OFF and to set the volume.
7. SQ
Use this knob to set the squelch threshold, which cuts off the receiver when
the signal is too weak for reception of anything but noise.
8. DW/TRI
Press and release this key to select Dual Watch mode, which monitors the
current working channel and CH 16 in cycle. Press and hold to select Tri
Watch, which monitors CH 16, the current working channel and the channel
you have set as the Secondary Priority Channel in cycle. See Section 4.12.