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GMDSS · 600 questions

Element 7 - USCG Exam Questions

GMDSS radio operating practices: digital selective calling, INMARSAT, NAVTEX, EPIRBs, search and rescue transponders, and distress, urgency, and safety procedures.

Every question below is a real U.S. Coast Guard exam question with four choices. Answer one and the correct choice is revealed instantly, with the USCG reference and illustration where the question uses one.

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All Element 7 questions

Questions 101–200 of 600 · page 2 of 6

  1. #389 How is a signal radiated from an Inmarsat-C system's antenna?
  2. #390 What statement is true regarding Inmarsat-C?
  3. #392 What are the directional characteristics of the Inmarsat-C SES antenna?
  4. #393 Which of the following best describes Inmarsat-C operation?
  5. #394 Which of the following best describes a shipboard Inmarsat-C system?
  6. #398 Which of the following best describes the full range of services provided by the Inmarsat-C Satellite system?
  7. #436 Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a shoreside TELEX terminal number 440122 i...
  8. #437 If your vessel is in the POR, which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a shoreside...
  9. #439 If your vessel is in the IOR, which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a shoreside...
  10. #440 If your vessel is in the AOR-E, which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a shoresid...
  11. #442 Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a fax machine number 516-229-4339 in Long...
  12. #444 Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a fax machine number 1424-8821-902 in the...
  13. #446 Which of the following is a correctly formatted Inmarsat-C address book entry for sending communications to a fax machine number (045) 334-5678 in Jap...
  14. #454 Upon receipt of SafetyNETTM messages of the Distress or Urgency category on the ship's EGC receiver, what action is required by the GMDSS Radio Operat...
  15. #458 What is the equipment arrangement that provides the maximum availability for reception of MSI broadcasts when using Inmarsat-C for TELEX communication...
  16. #459 Which of the following statements concerning EGC configuration is false?
  17. #466 What immediate remedy can be used to correct shadowing of the satellite signal by a shipboard obstruction?
  18. #479 How are paired SSB frequencies normally used?
  19. #480 For general communications purposes, paired frequencies are:
  20. #482 An ITU simplex channel frequency assignment is defined as:
  21. #483 An ITU duplex channel frequency is defined as:
  22. #490 Which statement regarding bandwidth and channel spacing is correct:
  23. #492 Which statement regarding channel spacing and bandwidth is true?
  24. #494 Communications with an emission of F1B/J2B would typically have a channel spacing of:
  25. #495 Communications with an emission of J3E would typically have a channel spacing of:
  26. #500 The proper sequence of emissions corresponding to the sequence AM-Voice DSB, SSB-Voice without carrier, USB-Voice with carrier and FM-Voice, is:
  27. #502 When placing a SSB MF/HF call to a Coast Station, you should always:
  28. #506 Through which coast radio station(s) may a U.S.-flag merchant vessel communicate?
  29. #510 A Distress Priority DSC call may be formatted and transmitted specifying and requesting:
  30. #529 When placing a TELEX call to a Coast Station, you should always:
  31. #534 Assuming sending a direct telex message to a shore-based office, which sequence of events best describes a complete ARQ telex exchange with a coast st...
  32. #554 In ARQ, when the information sending station (ISS) receives a signal that the parity check failed what happens?
  33. #556 Which of the following keystrokes or characters is sent as part of ARQ communications to request a direct TELEX call to a shore-based location?
  34. #565 The sequence ARQ, FEC, SFEC best corresponds to which of the following sequences?
  35. #568 If the vessel is within range of NAVTEX broadcasts and both the Inmarsat-C and the NAVTEX receiver are inoperative the GMDSS operator should:
  36. #570 If the vessel is experiencing atmospheric interference with NAVTEX broadcasts, especially in the tropics, the GMDSS operator should:
  37. #574 The "short rules" of propagation necessary to select the appropriate frequency band are:
  38. #575 GMDSS operators should learn which of the following propagation "rules of thumb"?
  39. #576 What would be the most appropriate HF bands for communicating from San Francisco to Taiwan or the Philippines?
  40. #577 GMDSS operators should routinely focus on the factors affecting propagation in what priority?
  41. #578 Which statement concerning frequency band selection and propagation most corresponds with standard practice.
  42. #584 At mid-day, what would be the best choice in attempting to communicate with a shore station some 75 miles distant?
  43. #595 What is the effect of temperature on the specific gravity of lead acid batteries?
  44. #604 What is the fundamental concept of the GMDSS?
  45. #605 What is the basic concept of GMDSS?
  46. #606 What is the responsibility of compulsory GMDSS vessels?
  47. #607 GMDSS is required for which of the following?
  48. #608 Which GMDSS system utilizes terrestrial radio techniques?
  49. #609 What equipment utilizes satellite communications?
  50. #610 What equipment is programmed to initiate transmission of Distress alerts and calls to individual stations?
  51. #611 What system provides accurate vessel position information to the GMDSS equipment?
  52. #612 Which of these can be used to receive MSI?
  53. #613 Which of the following regions lie outside Sea Areas A1, A2, and A3?
  54. #614 If a vessel is engaged in local trade and at no point in its voyage travels outside the range of a VHF shore station with continuous DSC alerting then...
  55. #615 SITOR (NBDP) equipment is a partial or alternate carriage requirement under GMDSS for vessels operating in which sea area(s)?
  56. #616 Which of the following is a functional or carriage requirement for compulsory vessels?
  57. #617 Which GMDSS communication functions must all compulsory vessels be capable of performing to meet International Maritime Organization requirements?
  58. #618 GMDSS-equipped ships will be required to perform which of the following communications functions?
  59. #619 What equipment can be used to receive Maritime Safety Information?
  60. #620 Which of the following are required GMDSS functions?
  61. #621 Which of the following are required GMDSS functions for vessels?
  62. #622 Within a single sea area, what is the primary reason GMDSS imposes carriage requirements for different radio subsystems?
  63. #623 If operating within Ocean Area A1, and outside of NAVTEX coverage, a GMDSS-equipped vessel must carry:
  64. #624 What is the equipment carriage requirement for survival craft under GMDSS?
  65. #625 Which of the following statements concerning GMDSS maintenance requirements is true?
  66. #626 Which of the following is a GMDSS requirement for all vessels over 300 gross tons operating within range of a MF-DSC equipped shore station?
  67. #627 What statement is correct regarding the maintenance requirements for A3 ships under GMDSS?
  68. #628 A ship operating in sea area A-3 must have the following provisions for maintenance:
  69. #629 A ship operating in sea area A-1 must have the following provisions for maintenance:
  70. #630 What is the primary frequency range for terrestrial communications using skywave propagation?
  71. #631 Which of the following systems is most susceptible to fading or static interference?
  72. #632 Which of the following systems is least susceptible to fading or static interference?
  73. #633 Which of the following systems is least susceptible to atmospheric disturbances?
  74. #634 Which system has the least effective radius of operation?
  75. #635 What statement best describes demodulation?
  76. #636 Which statement best describes amplitude modulation?
  77. #637 Which statement best describes frequency modulation?
  78. #638 What is the emission designation for VHF-FM?
  79. #639 Which of the following statements describes the carrier?
  80. #640 On what frequencies would the J3E emission be used for GMDSS Distress communications?
  81. #641 Which of the following statements is true?
  82. #642 What is the channel spacing for MF-HF voice frequencies?
  83. #643 What is the channel spacing for authorized F1B/J2B frequencies?
  84. #644 You look up a frequency table and all the listings end in either .0 or .5 kHz. What kind of emission is used with these frequencies?
  85. #645 How many SITOR (NBDP) signals can occupy the space of one voice signal?
  86. #646 Which mode occupies the least bandwidth?
  87. #647 Why is an antenna coupler/tuner required for MF-HF transmissions?
  88. #648 A vertical quarter wave antenna with a good ground connection will:
  89. #649 What is the most common type of antenna for GMDSS MF-HF?
  90. #650 What is the purpose or function of the antenna coupler/tuner?
  91. #651 What advantage does a vertical whip have over a long wire?
  92. #652 During an annual GMDSS station inspection:
  93. #653 Which situation is least likely to result in an inspection of the radio installation by foreign governments or administrations?
  94. #654 Which of the following references should be consulted for information on the proper setup and use of GMDSS equipment?
  95. #655 What publications should the GMDSS Radio Operator consult to review the proper procedures to be followed in Distress situations under GMDSS?
  96. #656 Which of the following documents or publications are required by the FCC for GMDSS vessels on international voyages (other than the Great Lakes)?
  97. #657 Which of the following documents or publications are required by Part 80 of the FCC rules for vessels on international voyages (other than the Great L...
  98. #658 Which of the following references should be consulted to identify the name of a vessel based on its Maritime Mobile Service Identity?
  99. #659 Which statement is true regarding the maintenance of GMDSS equipment at sea?
  100. #660 What determines the spares and maintenance materials requirements for GMDSS equipment?

Element 7 questions: what to expect

Q How many Element 7 questions are in the GMDSS pool?

There are 600 Element 7 questions on this site, every one released by the U.S. Coast Guard or taken from the National Maritime Center's sample examinations, with its correct answer. The exam draws its Element 7 module from the same pool.

Q What score do I need to pass the Element 7 module?

Most USCG exam modules, including Element 7, require 70 percent to pass. Rules of the Road modules require 90 percent.

Q Are these the real USCG Element 7 exam questions?

Yes. They are the published U.S. Coast Guard questions, matched to the National Maritime Center's 2026 sample examinations. Answer any question to see the correct choice, the USCG reference and the illustration where the question uses one.

About the GMDSS question pool

These are the published GMDSS Element 7 questions covering radio operating practices: DSC, satellite communications, NAVTEX, EPIRBs, and distress procedures. The GMDSS Radio Operator exam draws from this pool.