Furuno FM-2721 Operator's Manual page 25

Control, LED description
POWER switch (in hanger): Turns the system on/off.
DISTRESS button (in hanger): Sends the distress
alert when pressed more than three seconds.
Alarm LED: Lights when a DSC call is received.
(The alarm sounds also when a DSC call is received.)
[Call] key: Sends DSC call.
[Log] key: Displays received DSC call log.
[Cancel] key: Cancels last operation and returns to
previous display.
[File] key: Sends stored DSC call file.
[ ] key: Adjusts selected item in upward direction,
volume and squelch up.
[Enter] key: Terminates keyboard input.
[SQ ] key: Adjusts squelch. Shifts cursor left ward on
alphanumeric selection on screen.
[ ] key: Adjusts selected item in downward direction,
volume and squelch down.
[SQ.auto ] key: (Long press)Turns automatic
squelch on/off; (Short press) shifts cursor right word on
alphanumeric selection screen.
[ ] key: (Long press) Turns the loudspeaker on/off
[Scan] key: Starts/stops scanning. Press this key over
one second.
[H/L key]: Alternately selects transmitter output power
of 1 W or 25 W. Press this key over one second.
[ ] key: Adjusts LCD contrast and panel backlighting.
Press this key over one second.
[Lock] key: Locks/unlocks keyboard. Press this key
over one second.
[IntC] key: Enables intercom between #1 and #2
handsets. Press this key over one second.
[Setup] key: Opens the Setup menu.
[CH /INT/USA] key: Selects international, USA or WX
(wheather) channel alternately. (System setting is
required.)
[Private] key: Selects private channel. (System setting
is required.)
[CH16] key: Immediately selects CH16.
Monitor loudspeaker: Monitors receive signal when
handset is on hook.
Earpiece: Receiver for the handset.
PTT switch: Press to talk; release to listen.
Microphone: Speak in to the microphone while
pressing the PTT switch.
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