Chapter 2: Operation
26 DSC calls
channel for the following communicationIn the field CAT: select a DSC
call category, depending on the call type.
4. In the field TO: enter the 9-digit MMSI number of the vessel you want
to contact or use the phone book (PHBOOK) to select a contact.
5. In the field CH: enter the suggested VHF channel for following
communication.
6. Press the soft key SEND to make the call.
What is a Session?
A DSC session is defined as a collection of DSC calls (transmitted and/or
received) that are related to the same event (e.g. a distress event) or
established call (e.g. an individual call request followed by an
acknowledgement).
A session can be either active or on hold. The active session has control
over the radio transmitter. A session can have a purpose. For example if the
purpose is to establish a communication on a working channel.
The non-DSC VHF communication is considered as a session that can be
active (engaged) or on hold (dis-engaged). See also Engagement status on
page 16.
DSC call
type
Cat. To: Ch.
Session
icon
DSC call
category
INDIVIDUAL
(default)
XXXU, S or
R
Routine (default),
urgency or safety
calls, calls to a ship
or a station
SAFETY TEST — X — S Test call, check of
safety equipment
POSITION — X — S Safety
GROUP — X X R Routine
ALL SHIPS X — X S or U Safety (default) or
urgency
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