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GMDSS Maintainer
Element 9
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GMDSS Maintainer · 299 questions

Element 9 - USCG Exam Questions

GMDSS maintenance practices and procedures: VHF, MF-HF and satellite equipment, power supplies, digital theory, troubleshooting and the regulations for sea areas A3 and A4. The exam asks 50 questions; 38 correct passes.

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 9 questions

Questions 101–200 of 299 · page 2 of 3

  1. #101 Which would indicate proper operation of a SSB transmitter rated at 60 Watt PEP output in J3E mode?
  2. #102 Which of the following conditions indicate the proper operation of a 150 Watt MF/HF transmitter in the F1B ARQ mode?
  3. #103 Which of the following conditions indicate the proper operation of a 250 Watt MF/HF transmitter in the F1B FEC mode?
  4. #104 Which of the following conditions could cause very low RF output in a MF/HF transmitter operating in the F1B FEC mode?
  5. #105 which of the following troubleshooting methods is not valid for finding the fault in a MF/HF transmitter operating in the F1B FEC mode?
  6. #106 Which of the following conditions could cause zero RF output in a MF/HF transmitter operating in the F1B FEC mode?
  7. #107 Which of the following conditions indicate improper operation of a 150 Watt MF/HF transmitter in the F1B FEC mode?
  8. #108 What precedes the phasing signal in a DSC distress alert call?
  9. #109 What type of code is used for DSC transmissions?
  10. #110 What is the correct frequency shift and sub-carrier for MF-HF-DSC?
  11. #111 What is the time diversity reception interval for a MF-HF-DSC call?
  12. #112 A MF/HF Distress priority DSC call may be formatted to include the following:
  13. #113 What statement is false concerning DSC calls addressed to MMSI 003669999?
  14. #114 Which of the following statements concerning SITOR (NBDP) communications is true?
  15. #115 What statement is true regarding the exchange between two stations engaged in SITOR (NBDP) communications?
  16. #116 Which of the following is true of SITOR (NBDP) ARQ mode:
  17. #117 Which of the following keystrokes or characters follows most commands in ARQ communications when working an automated Coast Station?
  18. #118 Which characters are sent by the ship station to indicate a desire to send a message via a direct connection to a shoreside TELEX subscriber?
  19. #119 What are the characters that are transmitted to terminate a direct TELEX connection in SITOR (NBDP) operations?
  20. #120 If a vessel is within range of NAVTEX broadcasts and both the Inmarsat-C and the NAVTEX receiver are inoperative the GMDSS operator should:
  21. #121 The sequence ARQ, FEC, SFEC best corresponds to which of the following sequences?
  22. #122 Selective FEC communications (SFEC) are employed when:
  23. #123 Which of the following is true of SITOR (NBDP) Mode B (FEC), in the presence of static crashes.
  24. #124 If the vessel is beyond range of NAVTEX broadcasts and the Sat-C system fails, the GMDSS operator must:
  25. #125 If the vessel is experiencing atmospheric interference with NAVTEX broadcasts, especially in the tropics, the GMDSS operator should:
  26. #126 What is the purpose of the antenna tuner?
  27. #127 What is the electrical effect of an inductance in series with the antenna?
  28. #128 What is the electrical effect of a capacitance in series with the antenna?
  29. #129 Which of the following coaxial cables is suitable for use in GMDSS MF/HF antenna systems?
  30. #130 A ship’s MF-HF whip antenna breaks off and is carried away in a storm. What would you do to regain operation on MF-HF GMDSS frequencies?
  31. #131 Which of the following connectors is often used in GMDSS MF/HF antenna systems?
  32. #132 What are the frequencies for Inmarsat-C shipboard satellite operation?
  33. #133 What is an LNA?
  34. #134 What function does the LNA perform?
  35. #135 What is the fade margin factor?
  36. #136 What is signal to noise ratio?
  37. #137 What is the abbreviation for signal to noise?
  38. #138 Which of the following actions should be taken to minimize shock hazard of an Inmarsat terminal?
  39. #139 How do you perform a LOOP BACK test?
  40. #140 What do EGC messages contain?
  41. #141 Which of the following is not recommended for Inmarsat-C antenna installations?
  42. #142 How many NCS’s operate in each Inmarsat ocean region per Inmarsat system?
  43. #143 What type of services cannot be provided by the Inmarsat-C system?
  44. #144 The U.S. National Data Center that monitors polling input for each US Flag ship:
  45. #145 LRIT Long Range Information Tracking data:
  46. #146 LRIT Long Range Information Tracking:
  47. #147 When a compulsory equipped IMO ship is not correctly broadcasting LRIT Info what action should be taken?
  48. #148 What must a LRIT terminal do?
  49. #149 What satellite system does not support LRIT?
  50. #150 Which of the following Inmarsat units stores configuration data and contains all user interfaces and LED indicators?
  51. #151 Which of the following is not a function of an Inmarsat Fleet Broadband IP handset?
  52. #152 Which of the following best describes Inmarsat BGAN Streaming Data service?
  53. #153 Which of the following is the best procedure to test the Inmarsat Distress Alarm?
  54. #154 Which of the following is the correct Fax/Data configuration of a Fleet Broadband terminal?
  55. #155 Which of the following is not a characteristic of an Inmarsat Fleet Broadband IP handset?
  56. #156 What protocol can be used in connecting a PC to the LAN interface of an Inmarsat terminal?
  57. #157 When is a PIN Unlock Key (PUK) used with an Inmarsat terminal?
  58. #158 Which of the following is NOT a function of the LAN port on a Fleet Broadband terminal?
  59. #159 What is the configuration for Thrane & Thrane F250 & F500 facsimile operation?
  60. #160 What is the configuration Thrane & Thrane F500 for standard voice telephone operation?
  61. #161 Which of the following best describes a Subscriber Identity Module (SIM)?
  62. #162 What is the usual arrangement of GPS satellites?
  63. #163 What is the purpose of the Differential GPS system and how does it work?
  64. #164 How is the GPS usually interconnected with other bridge equipment?
  65. #165 Which of the following statements is true?
  66. #166 Which of the following best describes the GPS satellite signals transmitted?
  67. #167 What is the minimum number of satellites that must be received to provide the highest accuracy?
  68. #168 Which of the following best describes the polarization of a satellite signal?
  69. #169 Which of the following is characteristic of the parabolic dish antenna?
  70. #170 Which of the following best describes a phased array antenna system?
  71. #171 Which of the following is characteristic of an Inmarsat-C antenna?
  72. #172 What is a best practice for installing Inmarsat satellite antennas aboard ship?
  73. #173 What components does an Inmarsat Fleet Broadband RADOME typically include?
  74. #174 Which of the following conditions would prevent communications between an Inmarsat-C data port and external data terminal equipment (DTE)?
  75. #175 How can a LES/RCC (Rescue Coordination Centre) determine if an Inmarsat-C Distress Alert is a TEST transmission?
  76. #176 What is the meaning of the “ACB” Inmarsat-C Non-Delivery Notification (NDN) failure code?
  77. #177 What condition can indicate a communication failure between the second receiver (RX2) and the Antenna Control Unit (ACU) in an Inmarsat Fleet 77 termi...
  78. #178 Which of the following devices can cause interference to Fleet 77/55 systems?
  79. #179 What error message may be displayed if a connection to the Inmarsat Mobile Packet Data Service (MPDS) network fails?
  80. #180 An Inmarsat-C terminal shows a “No Receive Signal” alarm. There is no voltage on the antenna center pin. What is the most likely cause?
  81. #181 An Inmarsat-C terminal will not “LOG IN”. A test antenna cable with a new ADE attached in view of the satellite allows the terminal to “LOG IN”. What...
  82. #182 An Inmarsat-C terminal will not “LOG IN” and shows an “Antenna not connected” alarm. What action would you take?
  83. #183 The antenna goes past the AZ EL of the satellite but does not initialize but you can manually point the antenna at the satellite and acquire signal. W...
  84. #184 The antenna creeps up and down after initialization. What action would you take?
  85. #185 The antenna tries to initialize then points straight up and stops. What is the most likely problem?
  86. #186 What action should be taken if an Inmarsat Fleet Broadband antenna continuously changes azimuth after initialization?
  87. #187 What condition would cause failure of an Inmarsat-C terminal to power up when AC voltage is present at the input terminals of the power supply?
  88. #188 What condition would cause an IP connection failure between a technician’s laptop and an Inmarsat Fleet Broadband terminal?
  89. #189 What condition would cause a connection failure between a technician’s laptop and an Inmarsat Fleet Broadband terminal?
  90. #190 Interference induced from nearby HF transmitters may cause Inmarsat system failures. What is the most appropriate action to resolve this problem?
  91. #191 What condition will lower the observed bit rate on a Fleet Broadband terminal?
  92. #192 Which is not a function of a satellite under COSPAS-SARSAT using satellite EPIRBs?
  93. #193 What is the purpose of the magnet in the EPIRB mounting bracket?
  94. #194 How often must the EPIRB battery be replaced?
  95. #195 What feature is not a component of a 406 MHz satellite EPIRB?
  96. #196 How often must the automatic release mechanism be replaced.
  97. #197 Which of the following is normally part of 406 MHz satellite EPIRBs?
  98. #198 How should the signal from a Search And Rescue RADAR Transponder appear on a RADAR display?
  99. #199 In what frequency band does a search and rescue transponder operate?
  100. #200 What causes the SART to begin a transmission?

Element 9 questions: what to expect

Q How many Element 9 questions are in the GMDSS Maintainer pool?

There are 299 Element 9 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 9 module from the same pool.

Q What score do I need to pass the Element 9 module?

Most USCG exam modules, including Element 9, require 70 percent to pass. Rules of the Road modules require 90 percent.

Q Are these the real USCG Element 9 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 Maintainer question pool

The FCC Element 9 pool for the GMDSS Radio Maintainer licence: radio system theory, amplifiers, power sources, troubleshooting, digital theory and GMDSS equipment regulations for sea areas A3 and A4.