NAVICOM RT-550 Owner's Manual - page 10
5
DIGITAL SELECTIVE CALLING
5.1 GENERAL
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16
DSC(Digital Selective Calling) is a semi-automated method of
establishing a radio call, it has been designated by the International
Maritime Organization (IMO) as an international standard for
establishing VHF, MF and HF radio calls. It had also been designated
part of the Global Maritime Distress and Safety System (GMDSS). It is
planed that DSC will eventually replace aural watches on distress
frequencies and Will be used to announce routine and urgent maritime
safety information broadcasts. This new service will also allow mariners
to initiate or reveive distress, urgency, safety and routine calls to or
from another vessel equipped with a DSC transceiver.
5.1.1
MARITIME MOBILE SERVICE IDENTITY
An MMIS is a nine-digit number used on Marine Transceiver capable of
using Digital Selective Calling (DSC). This number is used like a
telephone number to selectively call other vessels. Refer to section 6.12
(USER MMSI ENTRY).
5.1.2
HOW CAN I OBTAIN A MMSI ASSIGNMENT?
Contact your dealer or NAVICOM
WARNING
This radio is designed to generate a digital maritime distress and safety
call to facilitate search and rescue. To be effective as a safety device,
this equipment must be used only within communication range of a
shore …based VHF marine channel 70 distress and safety watch system.
The range of signal may very but under normal conditions should be
approximately 20 nautical miles.
5.2
DSC CALL TYPES
Press the DSC/MENU key to pop up the menu for user to select the DSC
call type to send. Note that only three calls can be shown at any one time on
the screen.
Press + /- or rotate the CH knob scroll up and down the call types until the
cursor is positioned at the desired option.
Press the CH key the call types are:
Call Type
Description
LAST CALL
Recall last call no matter what type of call received at
last.
NEW CALL
Make a new call, by inputting the MMSI or pick up
from the list max 20 Buddy names.
GROUP
Sends transmissions that are only received by radios
that share a common group MMSI number, up to 3
group MMSI numbers can be stored and call.
ALL SHIPS
Make an Urgency, Safety or Distress call to all ships.
A re-confirmation screen follows the priority selection
of Urgency, Safety or Distress. Such call will be sent
out when assistance need but the situation not is so
serious enough for a Distress Call. Urgency call is
made when assistance required but not life endanger
while Safety call is for advisory alert
.
DISTRESS
Distress call send out the position and time
information from the input NMEA data along with your
MMSI number. This digital information lets other ships
and shore equipped with appropriate DSC equipment
know where you are and that you are in a distress
situation, except immediate help is needed, never use
the distress call.
CALL LOG
Allow a review of all stored Calls by number and time
of call. An individual call type can be placed to the
selected MMSI/NAME in the LOG. The LOG
maintains all received call types except DISTRESS
calls. The call at the end of the list is automatically
erased. The earliest call stored at the end of the list.
There is 20 calls could be stored
.
DISTRESS LOG
Allow a review of all stored Distress calls by number
and time of call. An individual call type can be placed
to the selected MMSI / NAME in the LOG. The call at
the end of the list is automatically erased. The
earliest call stored at the end of the list. There is also
10 calls could be stored.
POS REQUEST
The option enables you to request GPS position
information from any vessel for which an MMSI
number is known, such request can pick up from
buddy list.
EXIT
quit the menu mode.
Navicom RT-550
Navicom RT-550