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8. DIGITAL SELECTIVE CALLING (DSC)
8.1 Introduction
Digital Selective Calling is a semiautomatic method for controlling VHF, MF and HF radio calls.
It
was also designed as part of the global marine security and emergency response system
(GMDSS). It is likely that DSC will eventually replace audio calls on emergency frequencies and
will be used to send urgent and routine radio-transmitted maritime security information. This new
service will allow crafts to send/receive calls of an emergency, urgent, security, or routine nature to/
from vessels equipped with a DSC transceiver.
To avoid accidentally sending a distress call or a call sent incorrectly, contact your
vendor or local authorities for updates on DSC operating and emergency procedures.
8.2 Mobile Marine Identification Service (MMSI)
Important! To send/receive DSC calls, the user must program his personal MMSI code into
the transceiver. This is a nine-digit number used by marine transceivers equipped for DSC
digital selective calling. This number is used much like a telephone number for contacting
other, specific vessels.
DSC transmissions can be done only if you have been assigned the individual MMSI
code and you entered it in your radio (otherwise the DISTRESS/DSC controls will be
disabled).
Sending a distress call without founded reason is a criminal offence. Never use this
function unless you find yourself in a situation that merits asking for help.
8.3 Navigating the DSC menu
NEPTUNE 100 offers many DSC functions. For this reason it was created
Once inside a sub-menu, you can return at any time to the main menu by pressing the
PTT button or long pressures of MENU/SELECT button.
To return to the radio mode, confirm
EXIT
in every menu.
8.4 Individual call (ROUTINE TO)
The user can carry out an individual call to a specific DSC station (a vessel or a costal station).
To carry out calls, you have to enter the MMSI code manually or recall it from the preprogramed
MMSI directory.
• Keep pressed
MENU/SELECT
till
DSC CALL
is displayed;
• Confirm your selection by pushing
MENU/SELECT
; the display will show
INDIVIDUAL
. Push
MENU/SELECT
again for confirmation;
Now you can choose whether inserting the MMSI code manually or recall it from the directory
previously set
• Scroll with the
UP/DOWN
keys the 9 digits composing the code;
• Confirm by pushing
MENU/SELECT;
• With the
UP/DOWN
keys select one of the 23 channels available (simplex) and confirm your
selection with
MENU/SELECT.
