Some usual questions to pass GMDSS test successfully 1. What is the major conception of GMDSS? – In the shortest time inform RCC and ships in the area, of distress to provide search and rescue operation with the minimum waste of time. 2.

​Some usual questions to pass GMDSS test successfully

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​Some usual questions to pass GMDSS test successfully

Some usual questions to pass GMDSS test successfully

1. What is the major conception of GMDSS?

– In the shortest time inform RCC and ships in the area, of distress to provide search and rescue operation with the minimum waste of time.

2. What is the major idea of GMDSS?

– Safety of navigation and safety of life at sea.

3. What is the secondary idea of GMDSS?

– Providing of MSI for ship and commercial connection.

4. Systems including in the GMDSS?

– Traditional systems VHF, HF, MF with DSC added. Inmarsat-C system, NAVTEX, EGC, (All sea areas except A4) MSI on HF in the area A4 and other ones, COSPAS-SARSAT system, Inmarsat-E system, SART (Search and rescue radar transponder).

5. What is sea area Al?

– Sea area covered by at least one coast VHF st'n with DSC added.

6. What is sea area A2?

– Sea area covered by at least one coast MF st'n with DSC added.

7. What is sea area A3?

– Sea area covered by Inmarsat system form 70N to 70S.

8. What is sea area A4?

– Sea area out of the Inmarsat zone.

9. What emergency equipment do you know?

– EPIRB COSPAS-SARSAT, EPIRB Inmarsat-E, EPIRB VHF, portable VHF transceiver, SART.

10. What information includes short D. A. call?

– MMSI of the ship in distress, Ps'n (last known), time (at Ps'n).

11. What information includes full D.A. call?

– MMSI of the vs'l in distress, Ps'n (last known), nature of distress, type of distress connection e.g. R/TLF Al – VHF Simplex, A2 – 2182 Voice, A3 and A4 SSB Voice.

12. After sending of DSC alert in what of a type of condition DSC controller is?

– In an auto repeat condition.

13. Till when autorepeat condition lasts?

– DSC controller receives DSC acknowledgement or operator stops the call.

14. What is MMSI?

– Maritime Mobile Selective-call Identity code.

15. What is MID?

– Maritime Identification Digits.

16. What DSC system produced for?

– For establishing connection and exchanges of distress and commercial messages by use of digital codes.

17. What is MSI?

– Maritime Safety Information.

18. What MSI includes on?

– Search and rescue to RCC, meteo to metarea, navigational to NAVAREA (16 areas), MSI in GMDSS: NAVTEX Al, A2, EGC A3, MSI on HF A4 (For frequencies see list of radio Determination and special service st'n Annex 1).

19. What is EGC-Safety net?

– Enhanced Group Calling Safety net.

20. Where and how EGC safety net works?

– It works in the INMARSAT zone, net coordination st'n, to Land Earth St'n to SAT., to Ship Earth St'n.

21. What is FEC?

– Forward Error Correcting.

22. On which frequency NAVTEX works?

– 518 kHz (490 kHz called national one), 4209,5 kHz additional.

  • What class of emission use NAVTEX? – F1B.
  • What kind of a FEC regime use NAVTEX? – FEС-С.
  • What dose it mean FEC-C?

– Forward Error Correcting – Circulating, that means that each message will be sent twice in case of:

NNN – more than 4% of mistakes to 100% information and then message will be sent again if failed again NAVTEX prints asterisk.

NNNN – less than 4% mistakes to 100% of information – good.

26. What dose it mean in NAVTEX message ZCZC B1B2B3B4?

– ZCZC – is service mark. B 1– is the name of the st'n. B2 – is the type of the message. B3 and В4 – are the number of message. If the number of message starts like 00 that means that is the distress message.

27. If you receive MSI by NAVTEX what is the normal range between your st'n and coastal st'n?

– Up to 200–250 nm.

28. What type of the message you will choose in the program menu whether you like it or not?

– A – Navigational Warnings. В – Meteorological Warnings. D – Search and Rescue information. E – Meteorological Forecasts. L – Navigational Warnings – additional to letter A.

29. How many working SATS use Inmarsat system?

– AOR-E-SAT 15,5 W. AOR-W-SAT 54 W. IOR-SAT 64 E. POR-SAT 178 E also there are 7 additional ones for emergency purposes.

30. What is the role of the SAT's in the Inmarsat system?

– As retranslator which is on 365000 km above the earth equator.

31. What dose it mean beostationary SAT?

– It means that SAT and earth move in the same direction with the same speed.

32. What for you do log-in and log-out procedure in Inmarsat?

  • Log-in is the enter to the system, register for SAT.
  • Log-out is the exit from the system.

33. You've sent D.A. by Inmarsat system and you have not received the acknowledgement from RCC, after which period of time you will repeat the procedure?

– After 5 minutes.

34. You've sent false D.A. by Inmarsat system how you gonna cancel it?

– We have to communicate with appropreate RCC and cancel it with distress priority, we can also use the telephony, well the quickest way is preferable.

  • What word do we use when we communicate in Distress? – MAYDAY.
  • What word do we use when we communicate in Urgency? – PAN PAN.
  • What word do we use when we communicate in Safety?

– SECUR1TE.

38. What dose it mean ARQ?

– Automatic Repetition reQuest (mode of TLX operation for point to point working between two stations).

39. What is the difference between FEC and ARQ mode?

  • In FEC mode message will be sent twice and if deliveries' are not succesfull – channel breaks.
  • In ARQ mode message will be sent 32 times and if deliveries are not succesfull – channel breaks.

40. What is the AAIC?

– Authority Account Identity Code.

41. What is the difference between Inmarsat standards С and A?

– Standard A: Antenna directional, direct TLX, direct Tl'f, numbers start from 1 of 7 digits.

Standard С: Antenna omnidirectional, TLX store and forward E-mail, numbers start from 4 of 9 digits.

  • What frequency use COSPAS-SARSAT emergency radio beacon? – 406 MHz Ships, 121,5 MHz Aircrafts.
  • On which frequency works Inmarsat-E emergency radio beacon? – 1,6 GHz.
  • What is the guaranteed time of location of COSPAS-SARSAT emergency radio beacon in the equatorial area?

– 1,5–2 hours.

45. What is the guaranteed time of locating of COSPAS-SARSAT emergency radio beacon?

– 30 minutes.

  • What is period of rotating of COSPAS-SARSAT SATS? – 100 minutes.
  • In which area Inmarsat -E radio beacons are used? – A1, A2, and A3 areas (not global).
  • What is the GMDSS requirements for SART?

– Radar 3 cm. Frequency 9 GHz.

49. What is the min distance of locating the SART with ship's radar antenna height of 15 m?

– 5 nm.

50. You are sailing from Rotterdam to Oslo. What GMDSS equipment you must have on board?

– For area A2: Portable VHFs, SARTs, EPIRB, NAVTEX (EGC Rx or HF NBDP in areas without NAVTEX), VHF (with Ch.: 06, 13, 16), VHF DSC, MF DSC transceiver.

51. You are sailing from Antwerp to Ijmuiden. What GNDSS equipment must you have on board?

– For area Al: Portable VHFs, SARTs, EPIRB, NAVTEX (EGC Rx or HF NBDP in areas without NAVTEX), VHF (with Ch: 06,13,16), VHF DSC.

52. What GMDSS equipment must be installed on board of the ship in area A4?

– Portable VHFs, SARTs, EPIRB COSPAS-SARSAT, NAVTEX, VHF

DSC, MF/HF DSC transceiver with telex

53. What difference between EPIRB Inmarsat-E and EPIRB COSPASSARSAT?

– Inmarsat-E: Position manually, frequency 1.6 hHz. COSPASSARSAT: Position determined by satellite (doppler freq.) frequency: 406 mHz – ships; 121,5 mHz – aircrafts.

54. What kind of message must you send when man overboad?

– Distress message.

55. What means abbreviation "LUT"?

– Local User Terminal (receive D.A. from EPIRB via satellite).

56. What picture will you see on the radar screen when SART is in working condition?

– More then 1 mile between SART and ship: 12 dots started from SART. Less then 1 mile 12 dots will change to wide arcs. Close of SART wide arcs will change into complete circles.

57. MMSI 002731323, 025345020, 306236701?

  • 002731323 started from 00 belongs to COAST station.
  • 025345020 started from 0 belongs to group of ships.
  • 306236701 belongs to ship ( 306 is Ned. Antills digits of country).

58. In what areas is it necessary to have on board?

– VHF DSC, SART, NAVTEX, EPIRB, Portable VHF – for all sea areas, A1, A2, A3, A4. MF DSC: A2.A3. WR-2182 kHz, EGC Rx: A2. A3, A4. MF/HF DSC: A3, A4. Inmarsat-A(C): A3.

59. For how long must SART be able to be on stand by?

– 96 hours.

60. When using telephone, which channel/frequency must be used for Distress communication?

– VHF – 16Ch. MF – 2182 kHz.

61. What specific purposes do the following DSC frequency have?

– VHF Ch70 Alerting call. 2187,5 kHz Distress calling frequency MF 2177 kHz Ship-to-ship call (usual) MF. 2189,5 kHz Ship-to-shore call (usual) MF.

  • What service dose SES Inmarsat-A provide? – Telephone, Telex, FAX.
  • How many hours of work, can accumulators provide? – 6 hours without EDG; 1 hour with EDG.
  • Define the following types of emission?
  • J3E – single sideband, suppressed carrier, telephone HF.
  • R3E – single sideband, reduced carrier, telephone.
  • H3E – single sideband, fall carrier, telephone MF (using 2182 kHz).

PROCEDURES

1. Procedures for DSC Distress Communications on VHF/MF A1, A2 areas.

  • Ship in distress: Sends DSC distress alert (Ch. 70 on VHF/2187,5 kHz on MF).
  • Assistant vessel: Records DSC distress alert. Prepares for receiving the distress communication in the same band in which DSC distress alert was received (Ch.16 on VHF/ 2182 kHz on MF) or 2174,5 kHz TLX.
  • CRS: Sends DSC distress acknowledgement to the vessel in distress (Ch.70on VHF/2187,5 kHz on MF). Sends information as soon as possible to an RCC.
  • Ship in distress: Records DSC distress acknowledgement. Then distress traffic is carried out by radiotelephony (Ch. 16on VHF/2182 kHz on MF) or 2174,5 kHz TLX, distress information "MAY DAY".
  • CRS: Distress traffic by radiotelephony (Ch.l6 on VHF/2182 kHz on MF) or 2174,5 kHz TLX with the vessel in distress. And sends DSC distress relay call (Ch.70 on VHF/2187,5 kHz on MF) if necessary.
  • Assistant vessel: Records DSC distress relay call and acknowledge the DSC distress relay call to the CRS by radiotelephony (Ch. 16 on VHF/2182 kHz on MF) "Received MAYDAY RELAY".
  • Ship in distress: Sends auto repeat of DSC distress alert (Ch.70 on VHF/2187,5 kHz on MF).
  • Assistant vessel: Only after receiving repeat of DSC distress alert, should acknowledge the DSC alert by radiotelephony (Ch. 16 on VHF/2182 kHz on MF) and after that informs CRS or RCC via appropriate radio communications means. Distress traffic with the vessel in distress. DSC Distress Relay Alert.

If CRS doesn't send distress acknowledgement by DSC within 5 min.

A ship knowing that another ship is in distress shall transmit a DSC distress relay alert IF:

the ship in distress not itself able to transmit the distress alert; the master of the ship considers that further help is necessary.

2. Procedures for DSC Distress Communications on VHF/MF A3, A4 areas.

  • Ship in distress: Sends DSC distress alert (Ch. 70 on VHF/2187,5 kHz on MF).
  • Assistant vessel: Records DSC distress alert. Prepares for receiving distress communication same band in which DSC distress alert was received (Ch. 16 on VHF/2182 kHz on MF) or 2174,5 kHz TLX.
  • Ship in distress: Sends auto repeat of DSC distress alert (Ch.70 on VHF/2187,5 kHz on MF).
  • Assistant vessel: Should acknowledge the DSC alert by use of DSC to terminate the call and after that inform CRS or RCC by any practicable means. Sends acknowledgement by radiotelephony or TLX "Received
  • Ship in distress: Records DSC distress acknowledgement. Then distress traffic is carried out by radiotelephony (Ch.l6 on VHF/2182 kHz on MF) or 2174,5 kHz TLX, distress information “MAY DAY”.
  • Assistant vessel: Distress traffic by radiotelephony (Ch.l6 on VHF/2182 kHz on MF) or 2174,5 kHz TLX with the vessel in distress.

MAYDAY"

  • Procedures for DSC Distress communication on HF using J3E or TLX FEC Mode A3, A4 areas.
    • How many pieces of portable GMDSS VHF transceivers must a ship of 450 tons gross tonnage be provided with?
    • Which channel is used for ship-to-ship alerting on the VHF band in the GMDSS system?

    CRS: Sends DSC distress acknowledgement to the vessel in the distress in the same band in which DSC distress alert was received. And sends DSC distress relay call if necessary.

    Assistant vessel: Records DSC distress relay call on HF from CRS. Definite frequency, acknowledges the DSC distress relay call to CRS by J3E in the same band "Received MAY DAY RELAY".

    If CRS doesn't send distress acknowledgement by DSC within 5 min.

    SOME ABBREVIATIONS

    GMDSS Global Maritime Distress and Safety System

    RCC – Rescue Co-ordination Center

    DSC – Digital Selective Calling

    D.A. – Distress Alerting call DSB – Double Side Band

    SSB – Single Side Band

    SART – Search And Rescue Transponder

    SES – Ship Earth Station

    EPIRB – Emergency Position – Indicating Radio Beacon

    NBDP – Narrow Band Direct Printing

    EDG – Emergency Diesel Generator

    Rx – Receiver

    CRS – Coast Radio Station

    SDR – Special Drawing Rights

    PART 2

    1. How many pieces of SART must a ship of 400 tons gross tonnage be provided with?

    1) 1. 2) 2. 3) 3. 4) 6. 5) 0.

    2. How many pieces of SART must a ship of 5600 tons gross tonnage be provided with?

    – 1) 0. 2) 1 . 3) 2. 4) 3 . 5) 6.

    3. How many pieces of portable GMDSS VHF transceivers must a ship of 1700 tons gross tonnage be provided with?

    – 1) 6. 2) 1. 3) 2. 4) 0. 5) 3.

    – 1) 0. 2) 1. 3) 2. 4) 3. 5) 6.

    1) 13. 2) 6. 3) 16. 4) 76. 5) 70.

    6. Which frequency is used for ship-to-shore alerting on the MF band in the GMDSS system?

    – 1) 2177 kHz. 2) 2189.5 kHz. 3) 2187.5 kHz. 4) 2182 kHz. 5) 2178.5 kHz.

    7. Which radioequipment is not necessary for the ships sailing in the sea area A4?

    – 1) NAVTEX receiver. 2) 406MHz EPIRB float free. 3) VHF DSC watch receiver. Telex (NBDP). 5) Inmarsat SES.

    8. Which radioequipment is not necessary for ships sailing in the sea area A2?

    – 1) MF watch receiver dedicated to 2187,5 kHz. 2) Telex (NBDP). 3) VHF DSC watch receiver. 4) Enhanced Group Call equipment. 5) Satellite EPIRB.

    • Which VHF channel dose the VHF emergency beacon use? – 1) 13. 2) 70. 3) 76. 4) 6. 5) 16.
    • What types of EPIRB's can be used in sea area A 4?

    – 1) Cospas-Sarsat or Inmarsat-E or VHF. 2) Inmarsat-E only. 3) Inmarsat-E or Cospas-Sarsat. 4) Cospas-Sarsat only. 5) Cospas-Sarsat or VHF.

    11. Which frequency dose Inmarsat-E EPIRB use for transmission of distress signals?

    – 1) 406 MHz. 2) 1,6 GHz. 3) 156,5 MHz. 4) 121,5 MHz. 5) 1,5 GHz.

    12. Urgency signal consist of the word?

    – 1) SECURJTE. 2) MAYDAY. 3) URGENCY. 4) PRU-DONCE. 5) PAN PAN.

    13. Which kind of station can have MMSI number 002184000?

    – 1) a concrete ship station. 2) group of ships. 3) a concrete coast station. 4) group of coast station. 5) no one.

    14. Which kind of station can have MMSI number 027954000?

    – 1) a concrete ship station. 2) group of ship. 3) a concrete coast station. 4) group of coast station. 5) no one.

    15. Which frequency is assigned for transmitting DSC distress alert on the MF band?

    – 1) 2177 kHz. 2) 2187,5 kHz. 3) 2189,5 kHz. 4) 490 kHz. 5) 2182 kHz.

    16. Which frequency can be used for MF DSC ship-to-ship calling for general communication?

    – 1) 2187,5 kHz. 2) 2189 kHz. 3) 2182 kHz. 4) 2177 kHz. 5) 2174,5 kHz.

    17. What modes of communication can be used in Inmarsat-C system?

    – 1) Telephony. 2) Telex. 3) Telephony/Telex/Facsimile. 4) Telephony/Telex/ Data. 5) Data/Facsimile.

    18. Which Inmarsat Mobile Number belongs to a Inmarsat-C Ship Earth Station?

    – 1) 673529300. 2) 800476210. 3) 217459300. 4) 532743210. 5) 459291300.

    19. Which Inmarsat Mobile Number belongs to a Inmarsat-A Ship Earth Station?

    – 1) 647523301. 2) 1405201. 3) 427355210. 3) 002737300.5) 16135010.

    20. Which address must you type to send message from your InmarsatC terminal to another Inmarsat-C ship station?

    • 1) Telex ocean region access code+ IMN.
    • 2) IMN + telephone ocean region access code.
    • 3) IMN + telex country code + telex ocean region access code.
    • 4) IMN + telex ocean region access code.
    • 5) Telex country code + telex ocean region access code + IMN.

    21. How many NAVAREA's are there in the world?

    – 1) 4. 2) 12. 3) 14. 4) 16. 5) 24.

    22. Which equation shows right radio between frequency (f) and the wavelength (Lambada) of radio waves?

    1) f= С/Lambada 2) f= СxLambada. 3) f= Lambada/С. 4) f=Cx6,28xLambada . 5) f=C/6,28.

    23. Are VHF radio waves reflected by the ionosfere?

    – 1) By D-layer and E-layer. 2) By all layers. 3) Not reflecte. 4) Only by F-layer. 5) Only by D-layer.

    24. What is the approximate range of MF radio waves during the day time?

    – 1) 30 nm. 2) 150 nm. 3) 600 nm. 4) 1200 nm. 5) 2500 nm.

    • What is the wavelength, if the frequency is 6 MHz? – 1) 180 m. 2) 18 m. 3) 500 m. 4) 50 m. 5) 0,2 т.
    • What is the frequency, if the wavelength is 7, 5 meters?

    1) 40 MHz. 2) 4000 MHz. 3) 22,5 MHz. 4) 2500 MHz. 5) 25 MHz.

    27. The abbreviation of telephony mode of radiation using phase modulation?

    – 1) F3E. 2) R3E. 3) G3Е. 4) FIB. 5) Р3Е.

    28. The abbreviation of telephony mode of radiation using amplitude modulation ( single sideband, suppressed carrier)?

    – 1) R3E. 2) J3E. 3) НЗЕ. 4) J2B. 5) A3Е.

    29. The abbreviation of telephony mode of radiation using amplitude modulation (single sideband , full carrier)?

    – 1) R3E. 2) J3E. 3) J2B. 4) A3Е. 5) НЗЕ.

    30. The abbreviation of telegraphy mode of radiation frequency modulation (narrow band direct printing)?

    – 1) F3E. 2) F1С. 3) F1В. 4) G3Е. 5) G1D.

    31. Which currencies must be used in international charging for radiocommunication?

    – 1) USD. 2) SDR. 3) Colg France and USD. 4) SDR and Gold France. 5) Gold France.

    32. Should lead batteries and Ni-Cd batteries be located in the same battery room?

    – 1) Yes. 2) No. 3) Yes, in case the battery room large enough. 4) Yes, in case the battery room has compulsory ventilation. 5) Yes, in case of maintenance lead batteries.

    33. What the minimum operation time of reserve source of energy on ships without an emergency energy source?

    – 1) 1 hour. 2) 6 hours. 3) 12 hours. 4) 24 hours. 5) 48 hours.

    34. What is minimum operation time of reserve source of energy on ships with an emergency energy source?

    1) 1 hour. 2) 6 hours. 3) 12 hours. 4) 24 hours. 5) 48 hours.

    35. What is total voltage and capacity of two 12V batteries coupled in series, if each battery has capacity of 100 Ah?

    – 1) 12V 100 Ah. 2) 12V 200 Ah. 3) 24V 100 Ah. 4) 24V 200 Ah. 5) 24V 50 Ah.

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