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3-26 Operation with a Fist Microphone
As with any DSC operation, the call is made on channel 70. If a received
signal is confirmed to be addressed to the group that your station belongs
to, the radio switches to DSC receiving mode and does not send back an
acknowledgment. If the received signal is not addressed to the group that
your station belongs to, the unit returns to the mode before receiving the
Group Call.
After receiving a Group Call, press and release the DSC key to accept the
call. The unit switches to channel 16 and extinguishes the DSC indicator,
indicating the unit has exited the DSC mode.
The large channel display indicates the working channel and the small
channel display is extinguished. If you do not wish to acknowledge the
call, press the 16/9 key to exit the DSC mode.
PRESS & RELEASE
DSC
Receive Group Call:
Routine, Safety, or Urgency
Call accepted.
Converse on channel 16.
3.3.17.5 Distress Call
A Distress Call allows you to send out a digital "packet" of data at high
power that includes your position, time, and MMSI number. All ships and
stations outfitted with the correct type of DSC equipment will be able to
pinpoint your position and either relay the information or respond directly.
Using the Distress key overrides all other functions.
Sending a Distress Call
1. On the back of the microphone, lift the door marked DISTRESS.
2. Press and hold the red Distress key for 5 seconds. After 1 second, the
LCD displays a countdown from four to zero, beeping every second.
3. When the countdown has completed, the radio enters the DSC mode,
sounds a loud alarm, and sends the digital information at high power.
Once transmitted, the radio monitors channel 70 for a Distress
acknowledge but also monitors channel 16 for emergency traffic.