By wave length is understood:
The distance travelled by a radio vibration in a period.
The propagation direction of a radio vibration.
The length of a single spike in a wave.
The propagation speed of a radio vibration in free space.
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.
According to the rules of GMDSS vessels are equipped with certain radio-communication devices depending on:
On area A4 the function “Transmission of ship to shore distress alerts” is mainly based on:
The use of VHF DSC and VHF Epirbs.
The use of HF DSC and COSPAS SARSAT Epirbs.
The use of HF DSC and Inmarsat Epirbs.
The use of MF DSC and Inmarsat Epirbs.
Is it necessary to state the accounting code of the vessel in fully automated radio telex-traffic with a coast-station?
No, when AAIC is unknown, it will be asked for.
No, because the AAIC is included in the radio telex-identification.
It depend upon your location.
On board you have to switch from transmitting to receiving and vice versa. The shore station can transmit and receive simultaneously. You are working with two different frequencies. This method is called:
A DSC distress alert is received. The message states that communication by radiotelex is prefered. One preferably uses:
For how long time should a SART transponder be able to operate in the active mode?
The prescribed test of EPIRB, SART and portable VHF radio set must be entered in:
What is the proper term used to describe a coast radio station that primarily handles chargeable ship-to-shore message traffic of a routine nature?
Network Coordination Station.
Public Correspondence Station.
What do you do after receiving a VHF DSC DISTRESS call?
You set watch on VHF channel 16.
You set watch on channel 13.
You send immediately a DSC DISTRESS ACKNOWLEDGEMENT call.
You send immediately a DSC DISTRESS RELAY call.
A distress alert on board may only be transmitted on explicit order of:
The navigating officer on duty.
The sensitivity of a communication receiver can be adjusted with:
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.
In radio telephony what is the “URGENCY CALL” which should be used to indicate that you have a very urgent message to transmit concerning the safety of another vessel or person?
SECURITE-SECURITE (3 times).
The propagation of radio-signals in the VHF-band is:
Dependent on the hour of transmission (day or night).
Dependent on the power emmited and the temperature of the atmosphere.
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.
You wish to send an e-mail using the Inmarsat-C installation. The message has to be composed in:
National language of the LES.
Onboard the following message is received on the DSC controller: DOO: 245329000 CH16; S distress ack 244123000. What station sent the distress acknowledgement?
Give the command after ga + for the transmission of a “store and forward”-message with radio-telex:
The display of the DSC-controller on board is showing the following lines: RX: 002442000; CH87; D Sellcall Routine. We’re asked to listen on:
Channel Delta of the coast station.
Radio telephony-channel 7 in the 8 MHz band.
One can check the functioning of the SART by:
Activating the SART and checking the effect on the radar screen.
Removing it from the holder and turning the SART upside down.
Lowering SART in to the sea.
Activating it by extracting the antenna.
The emergency battery of a GMDSS portophone:
Must be tested once a week.
Must be replaced before the expiry date is exceeded.
Must be charged after expiry date.
When on HF band a DSC distress alert is received, you have to listen to:
8 414,5 kHz (DSC distress frequency in 8 MHz).
The radio telephony distress frequency in the band in which the DSC distress alert was received.
The radio-telex distress frequency in the band in which the DSC distress alert was received.
According to the rules of GMDSS all vessels have to be equipped with:
At least three mariphones.
A possibility to receive MSI.
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.
Long distance communication in the HF-bands depends on:
The Inmarsat-satellites are located:
In a geostationary orbit at approximally 1 000 km Altitude.
Between Lat 70° N and 70° S.
Alternatively above the poles and the equator.
The compulsory testing of a prescribed EPIRB is to be done:
The type-indication of the radio set is mentioned in:
What are the NAVTEX messages categories which cannot be suppressed?
Which word will precede an urgency message?
Via a coast-station radio medical advice is asked using NBDP. What command has to be given after ga +?
Via Inmarsat-C a message is sent to an Inmarsat-C mailbox with a positive delivery notification (PDN). The ground station will:
Send a PDN, if the message has arrived in the mailbox.
Not send any PDN for this message.
send no PDN’s with messages intended for the mailbox.
Send a PDN, as soon as the message is collected from the mailbox.
What is the emergency frequency on MF (Medium Frequency) radio?
By the degree of selectivity of a receiver is meant:
Ability to receive all signals.
Ability to prevent variations in the strength of radio frequency signal received.
Ability to make weak stations audible.
Ability to distinguish weak stations from adjacent stronger stations.
If messages are received which aren’t intended for own ship:
They must be noted in the radio log book.
They must only be passed to the master.
They must be forwarded to the company.
They must not be used for any purpose.
The typical “daylight-frequencies” for long distance transmission are located in the:
You want to send a DSC-call in connection with a shore telephone-call. You must choose:
According to the rule of GMDSS, channel 70 is used for:
Distress and urgency traffic.
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.
A DSC-notice should be sent on VHF-channel:
The Satellite orbit in the Cospas-Sarsat system is:
The battery of an EPIRB should be changed:
Command of radio-traffic between vessels and coast stations lies:
Always with the coast station.
With the station that calls.
What is the most important factor influencing the HF range?
The power of the transmitter.
The number of oscillations of a wave per seconds is called:
The log-in of an Inmarsat-C installation is important:
To inform the NSC that one is available for messages offered.
To keep watch on Sat-C for safety messages.
To inform the LES, that one is available for messages offered.
To inform the addressee, that one is available for messages offered.
A distress-call, onboard via RCC, may only be given Receipt if:
OSC from the RCC concerned invites the vessels.
The OOW deems it necessary.
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.
By reduced transmitting power is meant in VHF a power between:
In what HF-band is long distance transmission possible when both stations are located in Darkness?
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”.
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.
Which equipment will detect a signal from a SART transponder?
The correct functioning of a DSC-modem can be checked by means of:
The built-in test facility in the modem.
Tester provided with the equipment.
The obligatory monthly transmission from the RCC’s.
The testing-mode of the ever present VHF-DSC-EPIRB.
Dish aerials are used with:
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.
On which frequency a ship must maintain a continuous watch when sailing in area A2?
What does the abbreviation DSC means?
Distress and safety call.
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.
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.
Automatic amplifier regulation is used for the following reasons:
With strong incoming signals distortion is reduced.
With weak incoming signals distortion is reduced.
With bad weather the signal is amplified.
With absence of incoming signals noise is reduced.
What are the NAVTEX messages categories which cannot be suppressed?
On board they want to have a dial-phone call via Inmarsat with the Apollogracht. In the guides the following ID’s are found for the Apollogracht: 344320000, 424432010, 424432020, 1300210, 36715. What ID should be chosen?
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”.
The authority to order the use of distress signal or distress alerts is:
The first person to discover the distress situation.
The person designated to maintain communication during distress situations.
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.
After confirmation that there is no other radio-traffic, we call on a VHF working channel of a coast-station. When you don’t get any reply:
You can repeat your call immediately.
You must wait 3 minute minimum before repeating your call.
You must wait 5 minutes before repeating the call.
You must wait 1 minute minimum before repeating your call.
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.
What is the purpose of the radiotelephony two tone alarm?
Alert COSPAS/SARSAT satellites.
Activate bridge watchkeeping receivers and attract the attention of the person on watch.
Attract the attention of the person on watch.
Activate bridge watchkeeping receivers.
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.
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:
The different layers in the ionosphere, important for radio propagation, are effected by:
Direction of the antenna.
The distance between the transmitter and the receiver.
The word CHANNEL is spelled conform the international phonetic alphabet:
Charlie, Hotel, Able, November, November, Echo, Liverpool.
Cornelies, Hotel, Alfa, November, November, Echo, Lima.
Charlie, Hotel, Alfa, November, November, Echo, Lima.
Cornelies, Hotel, Apple, November, November, Echo, Land.
The traffic list of a coast-station is a list of:
Call-signs of ships for which a radio-telephone call, a telegram or another call is intended.
Name of ship’s scheduled for berthing.
Pertinent navigational and weather information.
Names of ships which, on behalf of safety at sea, are being routed by a traffic control system.
For how long time should a “SARSAT COSPAS” epirb be able to operate on its batteries?
Your vessel is not in distress and not taking part in a distress operation. How would you impose radio silence on vessels which are interfering the distress traffic?
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.