Furuno FM-8800D - Manual (Page 23)

1. OPERATIONAL OVERVIEW
1-11
To turn off the scanning, do one of following four methods.
a) Press the CH16 key.
b) Press the CANCEL key.
c) If a handset is on-hook, off-hook it.
d) If a handset is off-hook, press the PTT switch. In this case, press the PTT
switch again to transmit.
Note: The scanning function is not available for INLAND-W mode.
1.2.11 Remarks on voice communications
Automatic acknowledge (DSC operation) is automatically changed to manual
acknowledge under voice communications (off-hooked). (The “auto” indication,
however, remains on the screen.) This is done to prevent a break in
communications.
Automatic acknowledge is automatically restored once voice communications
are terminated(on-hooked).
1.3 DSC Operational Overview
Digital Selective Calling (DSC) is the global calling system adopted by the ITU-R
and IMO for selective calling of coast station and ship radio stations. The DSC
system is used for both safety and routine calling. The GMDSS requires the use
of DSC for distress alerting and safety calling.
1.3.1 LED warnings
The LED below the DISTRESS key lights continuously when the distress signal
is transmitted.
The ALARM LED blinks in red (and alarm sounds) when a distress or urgent
message is received. The LED can be extinguished and alarm silenced by
pressing the CANCEL key.
The ALARM LED blinks in green (and alarm sounds) when a message other
than distress or urgent is received. Alarm is automatically silenced two minutes
after message is received.