User's Manual

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DSC Procedures | RS90 Operating Manual
Receiving DSC calls
Several types of DSC calls can be received from vessels or coast
stations within range:
Call type Page
Distress page 61
Individual page 61
All ships page 61
Group page 62
Geographic page 63
DSC test call page 64
General process
When the radio receives a DSC call, it does several things as follows:
• Sounds the alert tone to notify you of the call.
• Displays a flashing
icon on screen, which indicates that a call
has been received and stored in the call log. When all call in the call
log and distress log have been viewed, the icon stops flashing. For
information on call logs, see “Calling using the call log” on page
52.
• Displays the MMSI (or name) of the calling station. You can press
▲ and ▼ to view more details of the call, including the requested
working channel.
• For individual calls, displays “AUTO SWITCH” or “NO AUTO SW,”
depending on the INDIV REPLY setting. It will automatically or
manually send an an acknowledgement to the calling radio and
switch to the requested channel.
• For Group or All-Ships calls, displays “AUTO SWITCH” or “NO AUTO
SW,” depending on the Auto Switch setting.
With Auto Switch set to ON, when receiving a Group or All-Ships
call, the radio will automatically switch to the requested channel
if not cancelled within 10 seconds. This might disrupt important
communications that are already in progress on the current working
channel. To avoid this, you can prevent the radio from automatically
switching channel by setting the AUTO SWITCH option to OFF.
For information on setting the auto switch option, see “Automatic
channel switch options” on page 85.
The procedures for receiving calls with Auto Switch either on or off
are described below.
Draft v5.0
27 Feb 2014