GMDSS Flashcards by lachlan inglis

What are the MF frequencies for:
1. DSC alerting/ RT distress
2. Routine ship to shore DSC calling
3. Shore to Ship routine DSC calling
4. Ship to Ship Routine DSC calling
5. R/T Ship to Ship (Securite)

2187.5/2182 (R/T)
2189.5
2177
2177
2048

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What are the HF DSC frequencies for Distress Alerting, DSC and R/T

4MHz
6MHz
8414.5 KHz (preferred DSC)
8291 KHz (preferred R/T)
12 MHz
16 MHz

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What is the primary VHF inter ship routine channel/communications between Ships and Aircraft

Ch 06

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What is the ship-ship safety of navigation channel

Ch 13

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Satellite Special access code 32

what shall we do?
Medical Advice

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Satellite Special access code 38

Evacuate
Medical Assistance

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Satellite Special access code 39

999 Coastguard
Maritime assistance (example, oil spill)

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Satellite Special access code 41

Rain and sun
Weather obvs

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Satellite Special access code 42

It might hurt you!
Navigational warning

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Satellite Special access code 43

Where are we?
AMVER or ships positions reports

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MMSI codes:
0
00
4
7
970
111

0 Group call
00 coast station
Inmarsat C
Inmarsat FBB
AIS sart
SAR aircraft

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MSI frequencies
518kHz
490kHz
4209.5kHz
1.5/1.6GHz

Navtex international (english)
Navtex local language
Navtex tropical
Inmarsat and EGC Safety Net

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Frequencies for:
EPIRB Alerting
EPIRB Homing
SART

406 MHz (All sea areas)
121.5 MHz
9-10 GHz (x band 3cm)

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Maximum power output for:
VHF
MF
HF

25 W
400 W
1500 W (1.5Kw)
Always use the minimum power necessary for RELIABLE communications

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Why do we not call between ships on duplex?

Ship stations cannot hear duplex transmissions

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How long do we wait between routine calls on VHF?

Call-2 mins-call-2mins-call-3mins

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The four inter-ship routine VHF channels

06 Primary
08 Secondary
72
77

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On board communication VHF channels

15/17

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Who does GMDSS apply to

> 300 GT, on an international voyage
<300GT, carrying 12 or more passengers

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Every ship must be capable of:

Of transmitting ship-to-shore Distress Alerts by at least two separate and independent means.
Of receiving shore-to-ship Distress Alerts.
Of transmitting and receiving ship-to-ship Distress Alerts.
Of transmitting and receiving search and rescue coordinating communications.
Of transmitting and receiving on-scene communications.
Of transmitting and receiving locating signals.
Of receiving maritime safety information.
Of transmitting and receiving general radio-communications relating to the management of the vessel.
Of transmitting and receiving bridge-to-bridge communications.
Communications used in the Maritime Mobile Service can be prioritised as follows:

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Sea area operation requirements

Daily tests

Test DSC internally without radiating signal
Check battery voltage
Test batteries on and off load
Successful diagnostic test of Sat C
Check printers have adequate supply of paper

Weekly tests

Run emergency power supply if other than battery (generator)
test of DSC equipment by test call to a CS (VHF/MF/HF)

Monthly tests

TEST EPIRB and SART
Check EPIRB and SART for security and damage
Performance verification test of Sat C
test survival craft handheld VHF’s, check battery is in good condition with seal unbroken
Inspect battery system, boxes, framework, connections, SG
Inspect antennas for damage

Documents to be carried by GMDSS compliant vessels

Radio log book Ships license Certificates of radio operators Copy of the Post Office Act 1884 International Telecommunications Union List of Ships Stations and Maritime Service Identity Assignments ITU list of Coast Stations and Special Service Stations AMLRS vol 1-6

Distress MESSAGE Format

Mayday Identity (name, Call Sign, MMSI) Position Danger (nature) Assistance Number of Persons Information (any other information) Over Numbers are always said in the format TWO-FOUR, not Twenty Four

When may a station transmit a Distress Relay Alert

After receiving a distress alert that has not been acknowledged within 5 minutes When a vessel in distress is unable to make the alert themself When the controlling station or MRCC decides further assistance is required

Distress Alert Relay format (Call and Message)

Mayday relay x 3 All Stations/CS x 3 This is Name x 3 (own vessel) Call Sign MMSI Mayday Relay x1 Name + Callsign +MMSI (vessel in danger) Position Danger (nature) Assistance required Number of persons Information (other) Over

How would a CS alert ships to a distress in their area? Far from their area?

DSC Mayday alert relay to: All ships Group of ships Geographical Area Specific Vessel Distress alert relay through satellite, EGC through Inmarsat C

In Acknowledging VHF/MF DSC distress Area A1-A2 you would:

Wait a short period to allow MRCC to do so

Acknowledging VHF/MF DCS Distress Area A3-A4 In the vicinity of the distress

Acknowledge Immediately by R/T and inform an MRCC

You hear an VHF/MF DSC distress in A3-A4 You are not in the vicinity of the distress, and the distress alert repeats

acknowledge by DSC to terminate and relay the alert to an MRCC

Acknowledging HF DSC?

do not do by any means whatsoever, set watch to R/T frequency, if no acknowledgement by MRCC or no subsequent communications, relay the distress alert by any means (HF or Satellite)

False DSC alert Procedure

1. Let the alert finish 2. Stop it from repeating 3. Cancel alert by R/t giving your MMSI number 4. Inform an MRCC or CS by any means necessary

DSC distress Alert Mind Map

Where should we address MF/HF DSC distress alert relays, urgency, safety announcements?

Geographical area or specific group or individual station

DSC CALLS should be repeated when? And if not acknowledged a second time?

After 5 minutes After 15 Minutes

Direct/Space wave Ground wave Sky wave

VHF MF HF

Daylight layers D E F1 F2

1st layer, 3Mhz 2nd layer, 4MHz at night, 8Mhz in the day 3rd layer, 8-16MHz 4th layer, 16-30MHz

What is contained in: ALRS Vol. 1

Coast Radio Stations (public correspondence)

What is contained in: ALRS Vol 5.

Global Maritime Distress and Safety System

What is contained in: ALRS Vol. 6

Pilot Services and Port Operations

ITU documents

List of ship stations List of special services and radio determination stations Manual for the Maritime Mobile Service and Mobile Satellite Service Interco (international code of signals)

Which Communications equipment uses printers

NAVTEX DSC SAT C

What are the NAVTEX permanently selected messages and RECOMMENDED messages to select

A. Navigational Warnings B. Meteorological Warnings D. SAR Information E. Meteorological Forecasts L. Additional Navigational Services

Where do we find NAVTEX message list, and Area charts?

ALRS Volume 5 page 252 ALRS Volume 5 page 293

Letters on NAVTEX controller functions F D S P

Forward paper Dimmer Silence alarm Power

What is an NCS

network co-ordination station Responsible for overall frequency, line allocation and traffic management of a region for the Maritime Mobile Satellite Service (MMSS)

What type of Antenna does Inmarsat use?

Omni Directional