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Master 200 > GMDSS > Flashcards

GMDSS Flashcards

1
Q

What are ALRS are there?

A 
NP281 Maritime Radio Stations
NP282 Radio Aids to Nav, DGPS, Legal Time, Radio Time Signals and e Pos Fox Systems
NP283 MSI Services 
NP284 Met Obs Stations
NP285 GMDSS
NP286 Pilot services, VTS amd Port Ops
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2
Q

What is Sea Area 1?

A

Within 60 miles from a safe haven

Within VHF communication range with a shore station

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3
Q

What is Sea Area 2?

A

Up to 150 miles from shore

Excluding sea area 1

Within MF communication range

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4
Q

What is Sea Area 3?

A

Anywhere between 68 N or S

Excluding sea areas 1 and 2

HF and/or Sat C must be installed

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5
Q

What is Sea Area 4

A

Polar regions outside or area 3

HF equipment must be carried

Excluding areas 1 and 2

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6
Q

Under what circumstances can you use distress signals?

A

When there is grave and imminent danger

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7
Q

What are the various types of distress signal?

A 
DSC Distress
RT Mayday
Fire on deck
Gun fire 
Waving of arms
November Charlie flags
Pyrotechnics
Etc etc
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8
Q

What action needs to be taken if a distress is received?

A

Obligations:

Not to terminate a distress transmission unduly

Provide assistance if possible/required

Relay the distress if appropriate

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9
Q

What vessels does the GMDSS code apply to?

A

All vessels over 500grt

Voluntary for vessels below this

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10
Q

What is the frequency of an EPIRB

A

406 MHz

Only 5 watt power requirement due to low earth orbit (LEO) of the corresponding satellites.

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11
Q

What is the alert pathway for an EPIRB?

A

EPIRB - LEO Satellite - Local User Terminal (LUT) - Mission Control Centre (MCC) - MRCC

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12
Q

What is the coverage and accuracy of the EPIRB system?

A

Global coverage is achieved with a fleet of satellites

Accuracy is approx 3 miles using SARSAT system

As accurate as GPS using GEOSAR system

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13
Q

What is the range of a radar-SART?

A

Radar transmissions are line of sights so:

approx 10 miles from a ship

approx 30/40 miles from an aircraft

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14
Q

What frequency activates a radar-SART?

A

9 MHz

X Band

3cm wavelength

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15
Q

What is the effect of sea state on a radar-SART?

A

Flat calm is not ideal as radar pulses can be reflected by the sea surface.

In rough conditions range will be greater on peaks and lesser in troughs.

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16
Q

How do you know any SART is being interrogated and what should you do when this happens?

A

Alarm will sound

Light characteristics will change

Call on Ch16 and fire flares

17
Q

What is the SARTs batteries charge capable of?

A

96 hours in standby
Plus
8 hours of transmitting

18
Q

What should you not do with a radar-SART?

A

Deploy alongside a radar reflector as this may obscure the SART.

19
Q

What appears on the radar screen when a radar-SART has been interrogated?

A

12 dots, the closest of which is the position of the SART.

When within 1 mile, 12 arcs becoming concentric circles as it draws closer.

Radar range should be set to 6-12 miles to avoid target error.

20
Q

What is the make up of an AIS-SART id number?

A

970

Follow by XX manufacturer code

Followed by XXXX serial number

This is nor a unique id.

21
Q

What is the battery capacity of an AIS-SART?

A

Battery life is 96 hours of transmitting

22
Q

What are the transmission characteristics of an AIS-SART?

A

8 messages within 14 seconds every minute.

4 messages on VHF 161.975

4 messages on VHF 162.025

23
Q

How will a user know they have received an AIS-SART signal?

A

The following will be displayed on any equipment capable of receiving an AIS signal:

ID number
UTC time
Lat
Long
Range
Bearing 
A cross enclosed by a circle
24
Q

What will and AIS-SART no tell users?

A

It will not inform them if the signal has been detected as it has no receiver built in.

25
Q

Monthly testing

A

SART live transmission and visual inspection. Battery exp date.

EPIRB test button and visual inspection. Exp dates for battery and HRU

26
Q

What is the frequency of an EPIRBs low power homing signal?

A

121.5 MHz

27
Q

What are the characteristics of the VHF antenna?

A

Either dipole or whip

Can full, half or quarter the wavelength of CH16

Full whip being a little less than 2 meters long

As high as possible as works by line of sight

Omnidirectional

DO NOT deform the natural shape in any way as this will reduce the functional area of the antenna

28
Q

What are the characteristics of the MF/HF antenna?

A

Whip antenna between 7.5 and 9 meters

An antenna tuning unit is required to tune the whip over a variable frequency range

Can also be a wire antenna, commonly in a T or inverted L configuration

Omnidirectional

29
Q

What are the characteristics of a fleet 77 antenna?

A

Large steerable parabolic antenna which produces a pencil beam which increases the signal strength

Dishes weighing around 27kg

The bean must be with 5deg of the satellite which in turn must be 5deg above the horizon (even in distress communications)

Can have blind arcs if placement is compromised

Power requirements are large due to tracking and the large bandwidth required to support speech (with the transmitter alone operating at 50-100W)

30
Q

What are the characteristics of the satC antenna?

A

A small omnidirectional antenna

Weighing around 7kg

50W give a strong signal due to the narrow bandwidth

31
Q

What is the range of a navtex station?

A

300-400 miles

32
Q

What are the frequencies of navtex?

A

518 kHz in English

490 kHz in local language

33
Q

Where can you find details of navtex stations?

A

ALRS/ADRS volumes 3 & 5

34
Q

How many areas is the world divided into for navtex?

Which do you operate in mainly?

A

XXI area worldwide

IX Pakistan mainly

35
Q

What are the navex message type which you can’t deselect?

A

A Navigation warnings
B Met warnings
D SAR and piracy
L* Nav warnings additional

36
Q

What service is available through enhanced group calling (EHG)?

A

SafetyNET will provide met, SAR and nav warnings over the inmarsat system

Master 200 (22 decks)

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