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GMDSS Flashcards

1
Q

Methods of distress notification

A

Alarm signal or distress call from a vessel at sea, directly or by relay
Distress call or message by aircraft, usually by relay
Alert from vessels equipment, then relayed shore to ship
Visual or sound signals from a nearby ship

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2
Q

Functions of GMDSS

A

Alerting
SAR co-ordination
Locating
MSI broadcasts
General Comms
Bridge to Bridge Comms

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3
Q

What vessels are subject to GMDSS requirements?
What is the main factor for what equipment is required?

A

Commerical vessels 500GT and Over
The area of operation

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4
Q

Minimum GMDSS carriage requirements?

A

VHF radio installation, with Ch 16,13 and 6, DSC 70
2 Sarts if over 500GT
3 portable VHFs if over 500GT
A navtex reciever
Inmarsat EGC reciever

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5
Q

Where can we get more info on GMDSS?

A

ALRS vol 5

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6
Q

Areas A1-A4?

A

A1 within VHF range of a coast station in which continuos DSC alerting is available. 20-30M
A2 outside A!, but within MF range of a coast station, 150 M
A3 - Outside A2 but within Inmarsat coverage
A4 Outside A3, 77º N/S

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7
Q

What ar ethe 3 means of Ensuring availability of GMDSS equipment

A

*At sea maintenance - qualified officer, spares, manual
*Duplication of certain equipment
*Shore-Based Maintenance

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8
Q

What are the power supply requirements for GMDSS?

A

Main Power
Emergency Power
Dedicated Battery power

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9
Q

Battery Power, how long for? how should the changeover occur?

A

Battery power for 1 hr with an emergency generator, 6 hrs without
Must be charged by an automatic charger
Changeover from AC to battery must be automatic, such that data held by the equipment is not corrupted or lost.

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10
Q

What is NAVTEX?
How does it work
What frequency

A

International, Automated system for instantly distributing Maritime Safety Information (MSI)
Includes Nav warnings, Weather warnings and forecasts, SAR notices and similar
Tranmittd from a shore station, 250-400NM range
User selects which shore stations required in Vol 3
Connected to a printer on the bridge
518Khz for English
490 Khz for national language

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11
Q

Where could we lookup info on Navtex?

A

ALRS Vol 3 MSI
ALRS vol 5 GMDSS
MGN 375 MSI

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12
Q

Which are the mandatory Navtex categories?
What are the letters also used for?

A

A Nav warning
B Met Warnings
D SAR info and pirate warnings
L Additional Nav Warnings

ALSO select letters dor the sea areas operating in. It is easy to confuse the letter for msg categories, for the letters for sea areas

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13
Q

GMDSS daily Checks

A

DSC, Internal Self Test of all
Battery state of charge
Printer paper
Radio log, checked and signed by master

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14
Q

GMDSS Weekly checks

A

Test DSC with a Coast station 2187.5
Test reserve generator
Survival craft 2 way radios, without opening sealed batteries

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15
Q

GMDSS Monthlies

A

EPIRB self test
Battery and HRU expiry date
Security, cleanliness and integrity of stowage

SART, test against radar
Visual check
BAttery date

Battery Room
State of charge, on/off load
Secured
Electrolyte levels, topped up with distilled water
Specific Gravity, with hydrometer
connections clean
compartment clean/ ventilated

Antennas and insulators - clean, secure, fittings free of salt

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16
Q

What should be the voltage of one on charge cell
or a 24V battery of 12 cells

A

2.25 per cell
27V for an on charge battery, although 26.7 seems to be the real value

17
Q

Uses of the 3 radio code words

A

Mayday - Grave and imminent danger to life
Pan Pan - Urgent message regarding safety of vessel or person
Securite - Important navigation or weather warning (not for routine weather forecasts)

18
Q

How would you send a Mayday Relay?

A

By voice only, not DSC

19
Q

Reciept of Distress, VHF, Mid atlantic

A

Listen Ch 16 for comms, immediately acknowledge
Call Master
Gather as much info as possible
Consider Relay by voice
Proceed to the casualty at best speed
establish comms with CRS and other nearby vessels
prep to assist
Xband to look for Sart
look outs
rescue boat
Medical team

20
Q

Receipt of a distress, VHF, A1

A

Listen Ch16, defer for 5 mins to allow CG to respond
Call master
If no response from CG, acknowledge by voice
Gather info
Consider Mayday relay by voice
Proceed to the casualty at best speed
establish comms with CRS and other nearby vessels
prep to assist
Xband to look for Sart
look outs
rescue boat
Medical team

21
Q

Receipt of Distress DSC, MF, mid atlantic

A

Tune to 2182, listen for 5 minutes
Gather info
If no response from MRCC, acknowledge
Call Master
Consider Mayday relay by voice
Proceed to the casualty at best speed
establish comms with CRS and other nearby vessels
prep to assist
Xband to look for Sart
look outs
rescue boat
Medical team

22
Q

Reciept of Distress by HF, any area

A

Tune to appropriate frequency, listen for comms
Do not acknowledge
If no acknowledgement, relay ashore

23
Q

Mayday Relay

A

Mayday Relay x 3
All Ships/ Specific CG x 3
Ships Name x 3
Mayday
Ships name, C/S, MMSI
Position,
Nature of distress
I require immediate assistance
Number of persons on board
Other info
Over

24
Q

Mayday call?

A

Mayday x 3
Ships name x 3
C/S , MMSI
Mayday
Ships name, C/S, MMSI
Position,
Nature of distress
I require immediate assistance
Number of persons on board
Other info
Over

25
Q

Ch 6?

A

Primary Ship to Ship, Air to Ship SAR

26
Q

Ship to Ship channels?

A

6, 8 , 72, 77

27
Q

Ch 13?

A

Bridge to Bridge

28
Q

How long before departure should the Navtex be switched on?

A

Check in Vol 5 for broadcast times of appropriate stations, have it switched on early to make sure you recieve them

29
Q

How to self test the Sat-C

A

Select appropriate region
Run link test

Also, if you have 2, send a message from one to the other

30
Q

How to test Fleet 77

A

in menu, select test distress, and follow on screen intructions

31
Q

What would you do if you see a red flare?

A

Take a bearing, approximate position
Then mayday relay

32
Q

What to do if accidentally send DSC alert, or activate EPIRB

A

Reset alert, equipment
Broadcast a message by voice cancelling the alert if vhf/MF/ HF
Contact nearest RCC to cancel alert
Log in GMDSS log

33
Q

Sat C codes 32 ,38, 39 used for?

A

Sac 32 Medical advice
Sac 38 Medical Assistance
Sac 39 Maritime Assistance

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