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For a DSC-connection (no “distress alert”) with another vessel the following frequencies are used:
TX: 2 187,5 kHz RX: 2 187,5 kHz.
TX: 2 177,0 kHz RX: 2 177,0 kHz.
TX: 2 189,5 kHz RX: 2 189,5 kHz.
TX: 2 187,5 kHz RX: 2 182,0 kHz.
MUF stands for:
Highest possible frequency that will be reflected by the ionosphere.
Most effective frequency, to make a connection with an HF-transmitter.
Highest possible frequency that can be made with an HF-transmitter on board.
The word SATCOM is spelled conform the international phonetic alphabet:
Sierra, Anna, Tango, Cornelies, Oslo, Mike.
Sierra, Able, Tango, Cornelies, Oslo, Man.
Sierra, Able, Tripoli, Charlie, Oscar, Mike.
Sierra, Alfa, Tango, Charlie, Oscar, Mike.
What does the abbreviation DSC means?
Distress and safety call.
Onboard the following message is received on the DSC controller: DOO: 245329000 CH16; S distress ack 244123000. What station sent the distress acknowledgement?
The effect of reflection of the radio waves in the ionosphere on the range depends on:
The correct adjustment of the dimmer.
The amount of ionisation.
The correct adjustment of the button band width.
The correct adjustment of the clarifier.
The wavelength of a radio-signal reflected against the F-layer may be:
The safety message announces that a station:
Is going to be under repairs.
Is in serious and imminent danger and needs immediate assistance.
Will relay a message concerning an important navigational or meteorological warning.
Has an very urgent message concerning the safety of a vessel, a plane or another means of conveyance.
How will you start a cancelling message after you send by mistake a distress call on your VHF DSC equipment?
PAN-PAN – All Stations – This is “SAINT-ROMAIN”.
SECURITE – All Stations – This is “SAINT-ROMAIN”.
All Stations – This is “SAINT-ROMAIN”.
MAYDAY – All Stations – This is “SAINT-ROMAIN”.
In maritime communication two international treaties are primarily involved. They are:
SOLAS and the international treaty for messaging.
The IMO at London and the ITU at Geneva.
GMDSS hand book and MERSAR.
According to the rule of GMDSS, channel 70 is used for:
Distress and urgency traffic.
What HF-band is generally suitable for long distance transmission if one of two stations is Located in twilight?
An area within the radiotelephone coverage of at least one VHF coast station in which continuous DSC alerting is available is called:
To receive distress alerting and MSI via an Inmarsat-C set vessels must have:
A radio officer on board.
MF/HF radio telex scanner with printer.
Suitable for 518 kHz NAVTEX receiver.
Modulation is:
To enhance the side bands in relation to the carrier wave.
Blending LF & HF signals.
A distress alert on board may only be transmitted on explicit order of:
The navigating officer on duty.
Is it necessary to state the accounting code of the vessel in fully automated radio telex-traffic with a coast-station?
No, because the AAIC is included in the radio telex-identification.
No, when AAIC is unknown, it will be asked for.
It depend upon your location.
In the Inmarsat Maritime Communications Handbook one can find information about:
2 digit code telex services.
Numbers of fax subscribers.
If a coast-station doesn’t answer a call on VHF working channel or doesn’t send a reply signal:
You can repeat your call immediately when convinced that no other radio traffic is interfered with.
You can repeat your call after 2 minutes.
You must call on another working channel.
You must call on distress channel.
You receive a distress alert on HF Radio. What should you do?
Wait three minutes and if no acknowledgement is heard from a coast station you should relay the alert.
No response is necessary providing the vessel is more than 24 hours away.
Relay the message immediately on 2 182 kHz.
The ID of an Inmarsat-M station on board starts with:
With maintenance of batteries it is of primary importance that:
The space where the batteries are stored is properly ventilated.
There is proper relative humidity in the space where the batteries are stored.
There is an absolute free access to the battery space.
The battery of an EPIRB should be changed:
The hydrostatic release of an EPIRB should be changed:
For how long time should a “SARSAT COSPAS” epirb be able to operate on its batteries?
The following information must be given on the SART:
The name of the operator.
Date of replacement of the batteries.
The date of replacement of the hydrostatic release unit.
What is the first function of GMDSS?
Transmission and reception of on scene communication.
Transmission of ship to shore alerts.
Reception of shore to ship distress alerts.
Transmission and reception of signals for locating.
The DSC-controller display the following: DOO: 244562000 CH16; S distress sinking. After receiving this DSC message the following is done immediately:
Give a “DSC-acknowledgement”.
Listen out on VHF channel 16.
Send a “distress alert relay”.
With an EPIRB:
You must check the working of the charger and check the loaded condition of the battery.
You must check the date the battery must be replaced.
You must check the manufacturer of the battery.
You must check if it is attached properly to a railing with the required line.
In the traffic list a coast-station indicates that there is a radio telex-message for a vessel. To call for the message one should put in:
After ga + the radio telex-command msg + ?
After ga + ? the radio telex-command msg +.
After ga + the radio telex-command msg +.
After ga + the telex number of the ship.
The MF/HF-transceiver on board is tuned to the assigned frequency of a station. To make this connection the following mode is used:
What is SITREP an abbreviation for:
Ship Transmit Emergency Radio.
Survivor Indication Transponder Equipment.
Ship Indication Transmission Equipment.
The effect of reflection of the radio waves in the ionosphere on the range depends on:
The correct adjustment of the button band width.
The amount of ionisation.
The correct adjustment of the clarifier.
The correct adjustment of the dimmer.
MF communication is usually provided by:
DSC uses for automatic identification the MMSI. The identification 002442000 is assigned to:
A coast-station or coast guard-station.
You receive a distress alert on HF Radio. What should you do?
Wait three minutes and if no acknowledgement is heard from a coast station you should relay the alert.
Relay the message immediately on 2 182 kHz.
No response is necessary providing the vessel is more than 24 hours away.
A DSC-notice should be sent on VHF-channel:
What is the meaning of the abbreviation “RQ” at the end of a DSC sequence?
Acknowledgement broadcast.
To choose the HF-band, the time difference between 2 stations:
Is multiplied by the hour at the transmitting station.
Which wave length applies to a frequency of 2 000 kHz?
Under GMDSS rules the trading area A1 can be considered to be:
Within range of VHF coast radio stations.
Within the coverage of Inmarsat.
Within range of MF coast radio stations.
On area A1 the function “Reception of shore to ship distress alerts” is mainly based on:
The use of SART transponders.
The use of SARSAT COSPAS Epirbs.
The position of a 406 MHz Cospas-Sarsat EPIRB is:
Passed on by the EPIRB to the satellite.
Measured by the “dopler” shift in the signals.
Determined by satellites by means of directional aerials.
A DSC distress alert is received. The message states that communication by radiotelex is prefered. One preferably uses:
The Satellite orbit in the Cospas-Sarsat system is:
What does the abbreviation VHF means?
Variable Hertz Frequency.
The distress message is used when the vessel is threatened by a serious and imminent danger and is in need of immediate assistance. What is the telegraphy and telephony distress message like?
F F F (Telegraphy) / RESCUE-RESCUE (Telephony).
X X X (Telegraphy) / PAN-PAN (Telephony).
T T T (Telegraphy) / SECURITE (Telephony).
S O S (Telegraphy) / MAYDAY (Telephony).
Sea area A4 is in maritime radio traffic sea area:
Outside the sea areas A1, A2 and A3.
With the exception of sea areas A1, A2 and A3, within the range of Inmarsat-satellites, where continuous alarm is available.
Within VHF-radiotelephony-range of coast station, where continuous DSC-alarm is available.
When sending an OBS (weather report) with Inmarsat one should use Service Code “41”. With this address the weather report will always be transmitted to:
The meteorological office of the ship’s flag state.
MET office Washington, this office will take care of further dispatch of the weather reports.
The meteorological station connected with the CES used.
You want to send a DSC-call in connection with a shore telephone-call. You must choose:
The frequency 121,5 MHz is used for:
On area A1 the function “Transmission of ship to shore distress alerts” is mainly based on:
The use of SART transponders.
Which class of emission is used for VHF radio telephony transmissions?
A Cospas-Sarsat EPIRB can be used in:
Only in the sea-areas A1, A2 and A3.
Only in the sea-areas A2 and A3.
All sea-areas (A1 to A4).
For how long time should a SART transponder be able to operate in the active mode?
Which type of call will be sent by a ship adrift and needing the assistance of a tug? The weather is not bad and the ship will be aground 24 hours later.
Define the class of emission H3E:
Radiotelex and DSC – Frequency shift keying of carrier with error correction.
Radiotelex and DSC – Frequency shift keying of sub-carrier with error correction.
Radiotelephony – Single sideband full carrier.
Radiotelephony – Frequency modulation.
The prescribed test of an approved portable VHF radio set (portophone) must be done once a:
In the Maritime Radio Traffic the order of priority is:
Urgency traffic, distress traffic, safety traffic.
Urgency traffic, safety traffic, routine traffic.
Distress traffic, urgency traffic, safety traffic.
Safety traffic, distress traffic, urgency traffic.
Which equipment will detect a signal from a SART transponder?
Which word will precede an urgency message?
Give the command after ga + for the transmission of a “store and forward”-message with radio-telex:
Of the AM-signal:
Amplitude is variable and frequency of the carrier wave is constant.
Both amplitude and frequency of the carrier wave are variable.
Is not dependant on the frequency and amplitude.
Amplitude and frequency of the carrier wave are constant.
The type-indication of the radio set is mentioned in:
The sensitivity of a communication receiver can be adjusted with:
On area A3 the function “Transmission and reception of signals for locating” is mainly based on:
The use of SART transponders.
The use of SARSAT COSPAS Epirbs.
The word NAVTEX is spelled conform the international phonetic alphabet:
November, Apple, Victoria, Tango, Echo, X-mas.
November, Able, Valencia, Tripoli, Echo, Xantippe.
November, Alfa, Victor, Tango, Echo, X-ray.
November, Anna, Victor, Tango, Eduard, X-ray.
The prescribed test of EPIRB, SART and portable VHF radio set must be entered in:
When a DSC-message of the “distress” category is received, in order to start distress alert communication in so far as not indicated in the alert, you will switch to VHF channel:
According to the rules of GMDSS vessels equipped for all sea areas have to be provided with:
406,0 MHz Cospas-Sarsat EPIRB.
1,6 GHz Inmarsat/DSC EPIRB.
121,5/243,0 MHz VHF EPIRB.
A VHF transmission range is mainly determined by:
The height of the aerial.
The transmission power, propagation and the quality of the receiver.
Whether it is radio-telephony, radio-telex or DSC.
On board one can use the reflections in the ionosphere by the right choice of:
The length of the aerial.
The time of transmission.
The mode of transmission.
If a coast-station doesn’t answer a call on VHF working channel or doesn’t send a reply signal:
You can repeat your call after 2 minutes.
You must call on distress channel.
You must call on another working channel.
You can repeat your call immediately when convinced that no other radio traffic is interfered with.
With an Inmarsat-C installation there is the addressing-option “special”. Via this option:
You can send a message by express delivery.
You can deliver a message via a special telegram.
Give one of Inmarsat’s “special access codes”.
You can plan a message to be delivered at a special time.
If a ship according to the rules of GMDSS is equipped with an MF/HF radio set a DSC listening watch must be kept on:
2 187,5 kHz, 8 414,5 kHz and for instance 12 577,0 kHz.
All DSC distress frequencies.
2 182 kHz and channel 70.
8 414,5 kHz and on at least one of the following DSC frequencies: 4 207,5 kHz, 6 312,0 kHz, 12 577,0 kHz or 16 804,5 kHz.
You have an important navigational or meteorological warning to transmit. What call should proceed this message when made on the radio telephone?
SECURITE SECURITE (3 times).
The type of Inmarsat station A, B, C, M is recognized by:
The first four digits of the identification.
Last digit of the identification.
The first two digits of the identification.
The first digit of the identification.
An EPIRB has been activated accidentally. Which of the following is correct for cancelling the false distress alert?
Call the nearest coast station and inform it that a false distress alert has been transmitted.
Send a distress priority VHF DSC call and make broadcast to all stations.
Make broadcast to all stations on VHF 16.
Call a LUT and inform it.
What do you understand by the initials EPIRB?
This means: Emergency Plotting Indicator Response Beacon.
This means: Emergency Position Indicating Radio Beacon.
This means: Emergency Personal Indicator Rescue Beacon.
This means: Emergency Plotting Indicator Rescue Beacon.