C1 new (1-100 )
Navigational Communication Quiz
Test your knowledge of navigational communication systems, including GMDSS, DSC, and NAVTEX. This quiz is designed for maritime professionals as well as enthusiasts looking to deepen their understanding of radio communication protocols.
- 100 carefully crafted questions
- Multiple choice format
- Covers essential maritime communication regulations
What advantages does a vertical whip over a long wire ?
It radiates more signal fore and aft
It radiates strong vertically
It radiates directional for better propagation
It radiates equally well in all directions
Under GMDSS a compulsory VHF-DSC radiotelephone installations must be tested at what minimum intervals at sea ?
Annually , by a representative of the FCC
At the annual SOLAS inspection
Daily
Monthly
Choose from the following characters that are sent by the ship station when operating HF Telex, to indicate a desire to send message to AMVER ?
AMV+
AMV
MSG+
MSG
For a DSC distress call. The distress information is contained in four messages. What is the content of message 1 ?
Time
Nature of distress
Medical transport message
Position
With what system is a NAVTEX message transmitted ?
ARQ
FEC
SELFEC
PLB
How would you compare the frequency range for High Frequency ?
From 3-30 Mhz
From 300- 3,000 kHz
From 30-300 kHz
From 10-30 MHz
What are the categories of ships required to participate in mandatory ship reporting system ?
Any ship regardless of tonnage, flag or type as far as she is within the service area of the system
Only ship not under command, restricted in their ability to maneuver or having defective navigational aids
Only ships with gross tonnage of 5,000 and above
Any warship, naval auxiliaries or other ships owned or operated by a state only
If a NAVTEX warning message is received but it contains too many errors to be usable, what should a GMDSS Radio Operator's action ?
Initiate a request for Category A, B, L and D messages
Contact the NAVAREA coordinator and request a repeat broadcast
Ignore it. Vital NAVTEX messages will be repeated o the next scheduled broadcast
Listen to appropriate VHF weather channel for repeat warnings
Reference to Radio Regulation Article 1 Section III, Radio Services. What is meant by a radiocommunication service between earth stations at given positions, when one or more satellites are used ?
Mobile-satellite service
Space operation service
Fixed satellite service
Inter-satellite service
How does a mutual interference among NAVTEX stations avoided ?
Transmissions by stations are schedules to daytime and night time operation only
Transmitter power is limited to that necessarily for Coverage of assigned area
Transmissions by stations in each NAVAREA are arranged in a time-sharing basis
Transmitter power are schedules to night time and daytime operation only
In the EGC Safety net service, what type of NAVTEX warning is letter "A" represent ?
Meteorological Warning information
SatNAV messages
Navigational Warning information
Search and Rescue information
According to International Regulations, what is the other use of VHF Ch. 06 ?
For ships to shore communications
For ship to aircraft engaged in SAR operations
For routine DSC alerting
For on board communications
What should you do after receiving VHF DSC Distress Alert Relay from a MRCC ?
Listen for a Mayday Relay on Ch 70.
Listen for Mayday Relay message on VHF Ch 16
Immediately acknowledge by R/T on Ch 16
Immediately acknowledge by DSC on Ch 70.
In the International Code of Signals, what does a group of three letters indicates ?
A group from general signal code
The vessel national identity signal.
Urgency or an emergency
A group from the medical signal code
How would you use the radiotelephone safety signal ?
"Securite" repeated 3 times
"MAYDAY" repeated 3 times
"Calling all stations" repeated 3 times
"PAN PAN" repeated 3 times
Which is the message type with highest priority ?
Telephone call to owners
Gale warning
Request for berthing instructions
Radio Telex Letter (RTL)
SITOR equipment is a full, partial or alternate carriage requirement under GMDSS for vessels operating in which sea area ?
A1
A1 and A2
A3 and A4
A3
What part of a satellite EPIRB may function as a visual aid to rescue vessels ?
406 MHz signal from a satellite EPIRB
Strobe light
A 121.5 MHz emergency transmitter in a satellite EPIRB
Loud beeping tone emitted by the unit once a activated
What is the responsibility of compulsory GMDSS vessels ?
Vessel must transmit a DSC distress relay upon receipt of a DSC distress alert
Only the vessel closest to a Distress incident must render assistance
Every vessel must be able to perform communications functions essential for its own safety and the safety of other vessels
Vessels must immediately acknowledge all DSC distress alerts.
Which channel is designated for GMDSS digital selective calling ?
Channel 70 ( 156.525 MHZ)
2182.0 KHZ
Channel 6
406 Mhz
What is the term refers to the supply of electrical energy required to supply radio installations on every ship for the purpose of conducting distress and safety radio communications in the event of failure of the ship's main and emergency sources of electrical power ?
Ship's standby generator
Reserve Source of power
Ship's emergency diesel generator
Emergency power
Choose from the following ITU list that contains important information for the mariner in relations to radiocommunications, including the GMDSS (Global Maritime Distress and Safety System) and CP ( Public Correspondence ) service ?
ITU LIST IV Coast station / List of Radiodetermination and Special Service
ITU LIST V List of Ship Station and Maritime
ITU LIST VIA List of Call signs and Numerical Identities
ITU LIST VI of Radiodetermination and Special Service Stations
What is the most appropriate action for a GMDSS radio operator to take in a distress situation where immediate help is needed, but the vessel is not sinking nor needs to be abandoned ?
Switch off EPIRB and SART manually
Transmit distress call by HF/MF/ VHF DSC or Inmarsat
Notify the RCC (Rescue Coordination Center ) through VHF FM on channel 13
Transmit distress call by activating the radiotelegraph automatic alarm signal
The DSC controller is programmed to send out a distress alert. Which of the following is its other usage ?
It can be used to communicate with private coast station.
It can be used for other purposes except for distress alerting
It should not be used for other purposes except for distress alerting
It can be used to send messages to the owner and charterers.
Who shall comply with requirements adopted reporting systems and report to the authority all information required in accordance with the provisions of each such system ?
VTIS
The Master of a ship
Government of government concerned
IMO
What is meant by the term "PTT" ?
Pre-transmission tuning to reduce transmitter harmonic emission
A primary transformer tuner use to match antennas
The push to talk function which switches between receive and transmit
Precise tone transmission used to limit repeater access to only certain signals
How would you describe the main purpose of RT transmission on VHF Ch. 13 ?
It is for the ship-to-ship routine communications
It is for SAR aircraft communications to home onto an EPIRB
It is for ship-to-ship safety of Navigation communications
It is for cancelling a false DSC Distress Alert sent on Ch.70
What sea area is defined as being within range of a shore based MF station which provides for continuous DSC alerting ?
Sea area A2
Coastal water
Sea area A1
Sea area A3
Under what International Convention the Automatic Identification (AIS) was introduced ?
UNCLOS
IMO
SOLAS
STCW-95
In the preamble of the NAVTEX message, what is the technical code of the identity of the transmitting station ?
B1
B3
B4
B2
What is the possible reason for an individual battery cell to reverse polarity ?
The charging circuits are connected in the correct polarity but all of the cells are equally charge
The discharge current will effectively charge the weaker cell
High discharge rates without allowing for a cool down period
Insufficient charging which does no bring all of the cells up to full charge
What do you call the standard format used by an RCC or RSC and may pass information to OSC or CSS ?
The SITREP
The JASREP
The AUSREP
The MAREP
Why is regular updating of a ship's position in an Inmarsat-C installations is necessary ?
To keep the correct Inmarsat region
To keep abreast with AMVER reporting
To enter the correct data to the disk antenna
To have the correct position in case of accidents
What is the usually the first step for a GMDSS Radio Operator to take when initiating a Distress priority message via Inmarsat ?
By contacting the LES operator and announcing a Distress condition is in existence.
By contacting the LES operator using the radiotelephone Distress procedure "Mayday" ... etc
By dialing the correct code on the telephone remote unit
By pressing a "Distress Button" or Distress Hot Key" on the equipment
How would you explain the relay of DSC Distress alerts ?
Should always be done immediately to ensure a Coast Station receivers the DSC Distress alert
Was not originally an intended function of the GMDSS system but now is the preferred method to notify an RCC
Can quickly overburden the GMDSS system in the vicinity with improperly transmitted or inappropriately relayed DSC calls
Remains the preferred method for passing Distress message traffic to an RCC or Coast station
Choose from the following the required to maintain watch on a vessel certified for service in Sea Area A2
2187.5 kHz
2174.5 kHz
2182.0 kHz
2738.0 kHz
A shore-to-ship distress alerts relay initiated by a station of a rescue coordination center which receives a distress alert shall be addressed to any following, EXCEPT ?
Inland and Coastal waters
Coast station
Navigation lanes
Coastal and inland water
Under what International convention the Automatic Identification System (AIS) was introduced ?
IMO
SOLAS
STCW-95
UNCLOS
VHF-DSC radiotelephone installations must be tested at what minimum intervals at sea ?
Daily
At the annual SOLAS inspection
Annually by the class
Monthly
Which of the following situations would normally use the safety priority ?
Steering gear failure in approaching harbour
Engine failure in congested water
A scenario concerning an important navigational warning
Man overboard
When maintaining lead acid batteries, how would you show understanding the importance protective clothing should be worn ?
Because the battery compartment may be in a dangerous location
Because there is risk of electric shock
Because a volatile gasses may be emitted
Because a corrosive electrolyte is used
How would you demonstrate your action after sending a false Distress alert on VHF ?
Make a voice announcement to cancel the alert on Ch. 16
Make a voice announcement to cancel the alert on Ch. 22A
Make a voice announcement to cancel the alert on Ch.13
Send a DSC cancellation message on Ch. 70
How should communications be conducted on ship reporting, taking into a account any other relevant guidelines, criteria, regulations or instruments developed by IMO ?
In conformity with IMO resolution A 851 (20)
In conformity with IMO resolution A 433 (20)
In conformity with IMO resolution A 401 (92)
In conformity with IMO resolution A 356 (92)
What can you say about the frequency used in the international NAVTEX system ?
Navtex frequency is 4209.5 KHZ
Navtex frequency is 518 KHZ
Navtex frequency is 490 KHZ
Navtex frequency KHZ
What element of a DSC call describes the hour of the position and is given in UTC with the aid of 4 digits ?
Message 2 of distress calls
Message 3 of distress calls
Message 1 of distress calls
Message 4 of distress calls
What is a series of nine digits which are sent in digital form over a radio frequency channel in order to uniquely identify ship stations, ship earth stations , coast stations, coast earth stations, and group calls ?
Maritime Identification Digit (MID)
Official Number
IMO number
Maritime Mobile Service Identity (MMSI)
How would you demonstrate your action after sending a false distress alert on 12577.0 kHz ?
Make an "ALL STATIONS" can on all 5 HF TELEX frequencies cancelling the alert
Make an "ALL STATIONS" call on the associated 12 MHz J3E frequency cancelling the alert
Send a message to the nearest RCC via Inmarsat canceling the alert.
No action is necessary
You received an urgency call on VHF Channel 70. On what frequency are you going to listen for the complete message ?
Channel 13
Channel 12
Channel 16
Channel 70
In facilitating visual signaling, what are the most commonly used important two-letter signals which specify "I require immediate assistance" ?
AN
CB
BC
AL
Trading at SEA area A1, how would you best describe as being an area within ?
It is within MF RT range of an MF shore station
It is within VHF RT range of at least one shore station providing continuous VHF DSC alerting
It is within approximately 100 to 150 miles from the coast
It is within MF RT range of at least one shore station providing continuous MF DSC alerting
How many VHF frequencies are available under GMDSS for DSC distress related calls ?
Three
Two
One
Four
Can Routine DSC Alerts be made on 2187.5 KHz ?
Between 0900 and 1700 UTC
At ANY time
Between 1700 and 1900 UTC
At NO time
Which radio frequency/channels are reserved for emergency communication ?
2128 kHz / VHF Channel 16
2182 kHz / VHF 16
2182 kHz / VHF Channel 6
2168 kHz ? VHF Channel 8
What is the international VHF digital selective calling channel ?
500 kHz
156.35 MHz
156.525 MHz
2182 kHz
Which statement is TRUE regarding a vessel equipped with GMDSS equipment that will remain in Sea Area A1 at all times ?
HF SSB with 2182 kHz automatic alarm generator may satisfy the equipment requirement
The vessel must provided with a radio installations capable of initiating the transmission of ship-to-shore Distress alerting from the position from which the ship is normally navigated
HF or MF DSC may satisfy the equipment requirement
VHF DSC alerting may be the sole means of Distress alerting
How to alert other ship in the vicinity of the ship in distress and are based on the used on DSC in the VHF and MF bands ?
Ship to shore distress alert
Shore to ship distress alert
Ship-to-ship distress alert
Ship to aircraft distress alert
Regarding the maintenance of GMDSS equipment at sea, select from the following statement in INCORRECT ?
Ships must carry at least one person who qualifies as a GMDSS maintainer for the maintenance and repair of equipment if the at-sea maintenance option is selected.
All at sea maintenance and repairs must performed by or under the supervision of a person holding a GMDSS Maintainer license
The GMDSS maintainer may be the person responsible for ensuring that the watches are properly maintained and that the proper guard channels and the vessel's position are entered into the DSC equipment.
The GMDSS maintainer may not be the person designated to have primary responsibility for radio communications during Distress incidents even if licensed as an operator
Which of the following situations would normally use the voice designation "SECURITE" ?
Man Overboard
Message detailing important navigational warnings
Engine failure in congested waters
Message about steering gear failure in approaches
Your ship received a distress relay on DSC VHF channel 70, on what channel would you reply ?
11
15
14
16
When measured directly above given point, solar radiation in the ionosphere is the greatest or maximum during what time ?
At sunset
At noon
At night
At sunlight
Which of the following is CORRECT when a paper model NAVTEX receiver runs out of paper ?
The system will automatically change from receiving MSI by NAVTEX to receiving it by SafetyNETTM so that no messages will be lost
MSI messages may be missed because the unit cannot print them out
The unit is unable to print messages and all subsequent MSI broadcasts may be missed until the paper is replaced.
It may give off either an audible and/ or visual alarm
What is the frequency bands that would most likely provide reliable communications between two stations that are 100 miles apart ?
The High Frequency (HF) band
The Medium Frequency (MF) band
The Very High Frequency (VHF) band
The low Frequency (LF) band
What should the Master do if a technical failure prevents a ship from reporting in a Mandatory Ship Reporting System ?
Enter the fact and reasons for not reporting in the ship's oil record book
Enter the fact and reasons for not reporting in the ship's log
As long as you send rectification report when leaving the area covered by the system
Obtain permission from charterer and note the failure in the ship's log
When positive information is received that a ship or a person on board is in grave and imminent and in need of immediate assistance, what is the emergency phase to be declared ?
Critical phase
Uncertainty phase
SAR phase
Distress phase
What does the DSC control unit do if the GMDSS Radio Operator fails to insert updated information when initiating a DSC Distress alert ?
It will abort the transmission and set off an audible alarm that must be manually reset
It will initiate the DSC Distress alert but, as no information will be transmitted, rescue personnel will not be able to identify the vessel, its position or its situation
It will initiate the DSC Distress alert and default information will automatically be transmitted
It will initiate the DSC Distress alert but any station receiving it will have to establish contact with the distressed vessel to determine its identity, position, and situation
What is the reporting interval capability of AIS-SART in transmitting messages ?
10 minutes or less
5 minutes or less
1 minute or less
2 minutes or less
What is was the GMDSS- equipped vessel must carry if operating within Ocean Area A1, and outside of NAVTEX coverage ?
A GPS receiver
Equipment capable of reception of Maritime Safety Information by the Inmarsat enhanced group call system or HF SITOR (NBDP)
Equipment capable of maintaining a continuous DSC watch on 2187.5 kHz
An Inmarsat-B terminal
How would you summarize the number of sidebands present in the J3E mode ?
It has one upper sideband
It has two carries and one sideband
It has one lower sideband
It has two sidebands and a carrier
In the mandatory system under SOLAS Regulation V/11-1, where are the locations of ship reporting systems are shown ?
On the Chart Catalogue
On the relevant Admiralty Charts
On the relevant charlets
On the T & P Notices
What does MID stand for ?
Maritime Identification Digits
Maritime Indemnity Directory
Mobile identification Number
Mobile Interference Digits
Which statement support on the mutual interference on 518 kHz among NAVTEX stations ?
Transmitter power is limited, station assignment codes are not shared by other NAVAREAS and stations alternate between daytime and nighttime operations
All stations transmit at the same time but stations are limited to daytime operation only to reduce the radius of propagation
Transmission scheduled on a time-sharing basis, power limited and station assignment codes are geographically separated
Station codes are not shared by other NAVAREAS, transmission scheduled on a time-sharing basis and power limited
Which is true concerning a required watch on VHF Ch-16 ?
It is not compulsory at all times while at sea until further notice, unless the vessel is in a VTS system
It is not always compulsory in sea areas A2, A3 and A4
When a vessel is in an A1 sea area and subject to the Bridge-to-bridge act and in a VTS system, a watch is not required on CH-16 provided the vessel monitors both Ch-13 and the VTS channel
When a vessel is in a A1 sea area and subject to the Bridge-to-bridge act and in a VTS system, a watch is required on Ch-16 in addition to both Ch-13 and the VTS channel0
How far away may the SART indicated by a series of dots on the radar screen display ?
2 nautical miles
5 nautical miles
4 nautical miles
3 nautical miles
What does a GPS stands for ?
General Positioning System
General Positioning Services
Global Positioning Services
Global Positioning System
Reference to Radio Regulation Article 1 Section VI - Characteristics of emissions and radio equipment, what is meant by a single sideband emission in which the degree of carrier suppression enables the carrier to be reconstituted and to be used for demodulation ?
Suppressed carrier single-sideband emission
Full carrier single-sideband emission
Reduced carrier single-sideband emission
Single-sideband emission
If the Inmarsat-C terminal is inoperative but the vessel remains within NAVTEX coverage, which of the following message categories should not be disabled by the GMDSS Radio Operator ?
Search and Rescue information, navigational warnings and other electronic navaid messages
Navigational warnings, meteorological warnings and ice reports
Meteorological warnings, Search and Rescue information and Navigational warnings
Search and Rescue information, Meteorological warnings and ice reports
How would you describe the electrolyte of a lead acid battery ?
It is a dilute hydrochloric acid
It is a concentrated sulphuric acid
It is a concentrated hydrochloric acid
It is a dilute sulphuric acid
Identify from the following frequency bands would most likely provide reliable communications between two stations that are 100 miles (160 km ) apart ?
The Medium Frequency (MF) band
The Low Frequency (LW) band
The Very High Frequency (VHF) band
The High Frequency (HF) band
Choose from the following equipment carriage requirement for survival craft under GMDSS ?
At least two radar transponders must be carried on every cargo ship of 300-500 gross tons and two radar transponders (one for each side ) of every passenger ship regardless of tonnage
All cargo vessels above 300 gross tons and every passenger ship regardless of tonnage must carry three SCT units and two SART's
At least three SCT units and two SART's on every cargo ship between 300-500 gross tons and the same on all passengers ships regardless of tonnage
At least three SCT units and two SART's on every passenger ship and cargo ships of 500 gross tons and upwards
Which of the following ALRS volume includes radio details for : Listing of VHF Radio Direction-Finding Stations II. Radar Beacons (Racons and Remarks ) III. Known operational Automatic Identification System (AIS) IV. Aids to Navigation (AtoN) V. Radio beacons transmitting DGPS corrections VI. International Standard and Daylight Saving Times and Dates VII. International Radio Time Signal Broadcast details
Volume 3 (NP283)
Volume 1 (NP281)
Volume 2 (NP282)
Volume 5 (NP285)
Which of the following 3-letter signal means " To induce sleep, give two sedative tablets ?
MSJ
MSM
MSK
MSL
What are the mandatory DSC watchkeeping bands/channels ?
VHF Ch-70, 2 MHz NF DSC, 4 MHz and 8 MHz DSC
VHF Ch-70, 2 MHz MF DSC and 1 other HF DSC
8 MHz HF DSC, 1 other HF DSC, 2 MHz MF, DSC and VHF Ch-70
2MHz MF DSC, 8 MHz DSC, VHF Ch-16 and 1 other HF DSC
How many types there are in an AMVER reports ?
4
8
3
6
What should you do when attempting to contract other vessels on VHF Channel 16 ?
Limit Calling to 30 seconds and if no answers is received, wait 2 minutes before calling vessel again
Limit calling to 30 seconds
If no answers is received, wait 2 minutes before calling vessel again
Channel 16 used for emergency calls only
On which frequency are navigational and meteorological message normally sent on the NAVTEX system ?
518 kHz
2187.2 kHz
2182 kHz
500 kHz
What does CCIR stands for ?
International Radio Committee Code
International Radio Consultative Committee
International Radio Code Committee
International Radio Consultative Committee
A GMDSS equipped vessel must carry equipment capable of Medium (MF) DSC transmission and reception
When operating outside of VHF-DSC range of shore
Only if not equipped with the Enhanced Group Call system
In all operating ocean areas
When operating in areas of no INMARSAT coverage
Select from the following statement regarding the additional equipment carriage requirement imposed for the survival craft of vessels over 500 gross tons is TRUE ?
The ability to communicate in all modes with any shore station
A second radar transponder is required
Additional carriage of two radio equipped lifeboats aft.
Four additional portable VHF radios are required
What is the main purpose of transmission on 2174.5 KHz ?
For MF telex Distress, urgency and safety messages
For ship to ship RT communications for the Safety of Navigation
For NAVTEX English-language broadcast
For routine ship to ship telex message on HF
As stipulated in Appendix 16 to the RR, which of the following ITU List of Service Publication shall be provided to all ships stations for a Global Maritime Distress and Safety System (GMDSS) Installations is required by international Agreement ?
ITU LIST VI
ITU LIST VIIA
ITU LIST IV and V
ITU LIST VI and VIA
At what situation under GMDSS, whereby the ship is not allowed to depart from any port ?
The vessel does not carry a radio operator
The vessel is not equipped with fleet 77 terminal
The vessel is not capable of performing all required distress and safety functions
One of the OIC incharge do not posses GMDSS certificate
Which of the following is the frequency range for High Frequency ?
10 MHZ- 30 MHz
300-3,000 kHz
3-30 MHz
30-300 MHz
How do you describe the broadcast transmission of NAVTEX ?
Using FEC techniques
No more often than every two hours and should immediately follow the radiotelephone silent periods
NAVTEX is transmitted by commercial coast radio stations following their traffic lists
NAVTEX is transmitted only when an Urgency or Distress broadcast is warranted
What sort of equipment or device to be used as a homing signal by the search and rescue vessels in the immediate vicinity of the ship's in distress ?
406 MHz signal from a satellite EPIRB
Strobe Light
Flare gun
A 121.5 MHz emergency transmitter in a Satellite EPIRB
What is usually the First step for a GMDSS Radio Operator's action when initiating a distress priority message via Inmarsat ?
By pressing a " Distress Button " or "Distress Hot Key's " on the equipment
By dialing the correct code on the telephone remote unit.
By contacting the CES operator using the radiotelephone distress procedure "Mayday" etc.
By contacting the CES operator and announcing a distress condition is in existence.
How does a NAVTEX receive programmed to reject certain messages ?
By pressing "00" in the transmitter I.D. Block
The transmitting station's two digit identification can be entered to do select of its broadcast
By choosing a message category's single letter (A-Z) identifier and the deselecting
By entering the selcall of the transmitting station
What does COSPAS/ SARSAT Stands for ?
Search and Rescue Satellite Alternating Tracking
Search and Rescue Satellite Aided Tracking
Committee on Search and Rescue Aided Tracking
Coast Earth Station Search and Rescue Satellite Aided Tracking
What information is transmitted by a 406 MHz EPIRB alert ?
Nature of distress
Vessel name and identification
Vessel position
A unique Hexadecimal I.D. number
In INMARSAT operation, what is the two-digit code which correspondence to medical assistance ?
42
38
32
41
How long should reserve power source must be able to power all radio equipment plus an emergency light system ?
8 hours
12 hours
6 hours
24 hours
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