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Global Maritime Distress Safety System. GOC, MCA > General Knowledge > Flashcards

General Knowledge Flashcards

1
Q

Describe what an EPIRB is and what is uses to transmit a signal

Also what MHz does it transmit on?

A

Emergency position indicating radio beacon

Transmits on 406MHz to Cospas/sarsat satellites which follow a polar orbit giving global coverage

+ 121.5MHz Homing signal for aircraft

Manual start or float free HRU release.

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2
Q

GMDSS complient Inmarsat satellites communications use two different pieces of equipment, name both?

A

Sat C

Fleet 77

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3
Q

Describe sea area A1 and the necessary equipment and range.

A

Within VHF radiotelephone (voice) range of a VHF DSC coast station keeping continuous GMDSS distress watch

VHF DSC Ch70 - 24/7

About 30M

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4
Q

Ships sailing exclusively in GMDSS Sea Areas A2 must maintain continuous DSC watch on

A

2187.5 kHz and

Ch.70 VHF

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5
Q

What does GMDSS mean?

A

Global Maritime distress and safety system

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6
Q

GMDSS Sea Area A4 is best described as being an area within

A

76° - 90° North and 76° - 90° South

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7
Q

GMDSS Sea Area A3 is best described as being an area within coverage of the Inmarsat system (approximately 76° North - 76° South).

A

GMDSS Sea Area A1 is best defined as being within VHF RT range of at least one shore station maintaining continuous VHF DSC watch.

Whilst this may be around 30-50 miles where such a service was available, it would not be part of the ‘definition’ - and, in any case, there are many parts of the world where a VHF DSC service is not available.

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8
Q

Describe VHF radio with DSC?

Used for?

Useful for?

Range?

A

Short range communication

Used for -
Distress
Urgency 
Safety and routine messages.
RCC in case of emergencies
Useful for - 
Ship to shore
Ship to ship
Port control 
VTS vessel traffic systems
MSI maritime safety information 
And on board communications

Range dependent on height of antenna and power of transmission - around 30nm

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9
Q

What is DSC

A

Digital selective calling

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10
Q

Describe sea area A4 and the necessary equipment and range.

A

Any area outside area A1, A2, A3 which is north of latitude 076N and south of latitude 076S

HF DSC only. (Besides alerting purposes 406MHz EPRIB)

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11
Q

Describe a SART

Range at sea level and from an aircraft

A

Search and rescue radar transponder

Activated by 9GHz. X band, 3 cm radar from searching vessel - transmits a signal back giving range and bearing to the activated SART

Range at sea level 5-7nm and 30-50nm from aircraft-borne radar

AIS SARTs use newer technology to show casualties position using AIS

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12
Q

What is GMDSS’s purpose

A

To give access to the various rescue organizations using fully automated procedures.

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13
Q

Describe sea area A3 and the necessary equipment and range.

A

Within the global footprint of the INMARSAT geostationary satellite system

HF DSC also

Roughly (076N to 076S)

Where continuous alerting is available

(Excluding those A1/A2 areas which also fall with the footprint)

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14
Q

Describe sea area A2 and the necessary equipment and range.

A

Within MF radiotelephone (voice) range of a MF DSC coast station keeping continuous GMDSS distress watch

2187.5 KHz

About 250M

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15
Q

Describe MF/HF SSB radio with DSC?

Used for?

Useful for?

Range?

A

Medium to long range communications

Used for - distress,urgency, and safety and routine communication.

Useful for -
Ship to ship
RCC in case of emergencies

MF approximate range of 250NM

HF can be up to 7000NM

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16
Q

An EPIRB transmits at what frequency and to what type of satellite?

Range?

A

406MHz

To polar-orbiting COSPAS-SARSAT satellites

COSPAS - space system for the search of vessels in distress
SARSAT - search and rescue satellite-aided tracking

Worldwide

17
Q

Inmarsat stands for?

What area does it coverage?

A

International maritime satellite

076N and 076S
Outside these latitudes you cannot rely on your Inmarsat equipment, though it can reach higher latitudes in some areas

18
Q

GMDSS Sea Area A2 is best defined as being within

A

MF RT range

of at least one shore station maintaining CONTINUOUS MF DSC watch

19
Q

Describe a NAVTEX receiver
Its use
Range and
Frequencies?

A

International automated direct printing service for -

MSI MARITIME SAFTEY INFORMATION

Navigational warnings

Meteorological warnings & forecasts

Other urgent information to ships

  • from NAVTEX transmitting stations around the world

Range about 300nm

518KHz - ENGLISH
490KHz - LOCAL

20
Q

Daily GMDSS Equipment checks

A

GMDSS Batteries (on/off load voltage test)

VHF DSC internal test

MF/HF (SSB) DSC internal test

Printers/paper

21
Q

SART

Equipment used?
Frequency?
Range?
Monthly checks? 6
Battery life?
Minimum transmitting time?
A

X band radar to receive distress

9GHZ

Vessel 6-12miles / Aircraft 30-40 miles

Battery and HRU expiry
Self test 
Check top to bottom, 360˚ General condition 
Land yard/pole both 1 meter 
Lock

5 years

96hours

22
Q

EPIRB
Monthly checks? 5
Battery life?
Minimum transmitting time?

A 
Expiry date of battery and HRU
Self test
General condition 
Lanyard
Sea water contacts

5/10 years

48 hours

23
Q

Describe
Inmarsat FLEET 77 / Inmarsat C
Uses
Range

A

Uses - Distress, urgency, safety and routine communications.

Fleet 77 voice data and text

SAT C text only

Range - world wide coverage with latitudes 76* N and S. Up to 080* but Inmarsat will not guarantee this

24
Q

GMDSS Sea Area A3 is an area within

A

GMDSS Sea Area A3 is best described as being an area within coverage of the Inmarsat system (approximately 76° North - 76° South).

25
Q

Daily GMDSS checks and tests?

A

Batteries on/off load test (voltage and amps) in range of manufacturing requirements

DSC internal test

Printer - paper, ink, not jammed

26
Q

GMDSS weekly checks?

A

DSC EXTERNAL test

27
Q

GMDSS Monthly checks ?

A

DSC EXTERNAL test
Specific gravity test of batteries
Overall condition check of batteries

Hand held VHF’s

SART - live test (safety R/T call to all ships needed)

EPRIB - self test (follow manufacturer’s instructions)

Antennas - connections, fastenings, insulators, and visual inspection

28
Q

Inmarsat C -

How to facilitate transmission and reception of various types of maritime information?

A

Two digit codes

(If you forget - (“I would look in ALRS VOL 5, Inmarsat section”) page 206

Example -
32= medical assistance
38=medical assistance

Global Maritime Distress Safety System. GOC, MCA (6 decks)

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