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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 201–299 of 299 · page 3 of 3

  1. #201 At what interval must the SART’s battery be replaced?
  2. #202 What are the characteristics of the SART transmitted signal?
  3. #203 What is the approximate distance between dots on a radar display at a distance of 5 miles?
  4. #204 How often must the Survival Craft Transceiver battery be changed?
  5. #205 What is the minimum receiver sensitivity required for a Survival Craft Transceiver?
  6. #206 What is the minimum required effective radiated power?
  7. #207 Equipment for radiotelephony use in survival craft stations under GMDSS must have what capability?
  8. #208 Which statement is NOT true regarding the requirements of survival craft portable two-way VHF radiotelephone equipment?
  9. #209 Equipment for radiotelephony use in survival craft stations under GMDSS must have what characteristics?
  10. #210 Which of the following is the primary frequency that is used exclusively for NAVTEX broadcasts internationally?
  11. #211 The NAVTEX is powering on and appears to be functioning normally except there have been no new messages for an extended period. The station settings a...
  12. #212 How is a NAVTEX receiver programmed to reject certain messages?
  13. #213 How can reception of certain NAVTEX broadcasts be prevented?
  14. #214 How is accuracy insured in NAVTEX broadcasts?
  15. #215 NAVTEX broadcasts are sent:
  16. #216 What is the normal voltage of a single NICAD battery cell?
  17. #217 What is the effect of temperature on the specific gravity of lead acid batteries?
  18. #218 What will cause an individual battery cell to reverse polarity?
  19. #219 What is the normal specific gravity of a fully charged lead acid battery cell? What device is used to measuring the electrolyte of a lead acid battery...
  20. #220 What is a gel cell battery and how is it maintained & cared for?
  21. #221 What is the normal voltage of a single lead acid battery cell?
  22. #222 How often should high charging be use with a standard lead acid battery and a fully automatic GMDSS compliant Battery charger?
  23. #223 What are the different modes of charging for a GMDSS compliant battery charger/supply?
  24. #224 What would be an indication of a malfunction on a GMDSS station with a 24 VDC battery system?
  25. #225 What is the meaning of “Reserve Source of Energy”?
  26. #226 With a fully automatic GMDSS compliant battery charger / power supply, when must the high charging process be interrupted?
  27. #227 A fully automatic GMDSS compliant Battery charger/ Power supply’s high (Full) charging mode must be disabled during setup for what type batteries?
  28. #228 Which of the following best describes a standard full wave rectifier power supply?
  29. #229 Which of the following statements concerning power supply filters is true?
  30. #230 What are the main advantages of using switcher type power supply?
  31. #231 What are the disadvantages of using a switcher type power supply?
  32. #232 Power supplies with inductive input filters have the following characteristics:
  33. #233 Power supplies with capacitive input filters have the following characteristics:
  34. #234 What is the function of a crowbar circuit?
  35. #235 Which of the following is not one of the main advantages of a switching power supply?
  36. #236 What is the configuration for a mains operated switching power supply with output regulation?
  37. #237 Which of the following statements about switching power supplies is the most accurate?
  38. #238 What are the input/output voltages of a “BUCK” switching power supply with a 50% duty cycle?
  39. #239 Which of the following statements about a switching mode power supply input current is correct?
  40. #240 The printer will not print a document. Which of the following is NOT a likely reason?
  41. #241 There is no display on the monitor. What are the most likely causes?
  42. #242 What are the four main functions of the “BIOS” in most computers?
  43. #243 Power is on but the computer will not boot into the operating system. What steps should you take?
  44. #244 How do you determine the type of disc drives in an XP system?
  45. #245 What are important considerations when replacing a CD-ROM drive?
  46. #246 Nodes in an Ethernet network are interconnected using a cable making a “Home Run“back to the central:
  47. #247 What is the maximum length of a USB 2.0 cable between two hubs or between a hub and peripheral?
  48. #248 10Base-T and 100Base-TX systems generally uses the following type of cable:
  49. #249 What initial steps should be taken when installing a router?
  50. #250 What are the most commonly used IP addresses for routers?
  51. #251 In an Ethernet network, the available bandwidth is shared between all nodes within the same:
  52. #252 A typical PC program that is used widely for logging and troubleshooting NMEA 0183 data is:
  53. #253 what is the maximum signal voltage range that an NMEA-0183 unit must be capable of handling without damage?
  54. #254 The current and most recent version of NMEA 0183 uses what standard for data communications?
  55. #255 What type of data communication is used for NMEA 0183.
  56. #256 Which of the following statements about an NMEA -0183 system is correct?
  57. #257 An important difference between NMEA 0183 and NMEA 2000 is:
  58. #258 The Voltage of the NMEA 2000 backbone power supply pair must be maintained to within the following range.
  59. #259 NMEA 2000 Certified Device identify their current requirements in terms of LENs (load Equivalent Number). 1 LEN is equal to:
  60. #260 Which of the following are NOT components of a NMEA 2000 network?
  61. #261 The NMEA 2000 backbone operating speed is:
  62. #262 When viewing NMEA 2000 data you must use the following.
  63. #263 What is the maximum length for a drop cable to a single NMEA 2000 device?
  64. #264 What is a common range of frequencies used for depth finding equipment?
  65. #265 What is a common range of pulse widths used for depth finding equipment?
  66. #266 What is the purpose of the “carbon pile” on an older gyro compass?
  67. #267 What are the principles of operation of a fiber-optic gyro compass?
  68. #268 How does the Ship Security Alert System operate?
  69. #269 AIS units use the following:
  70. #270 What procedure must be followed before using C-Map charts for an Electronic Chart System?
  71. #271 Which of the following lists of data inputs for an Electronic Chart System is incorrect?
  72. #272 Which of the following is a necessary component of an auto pilot?
  73. #273 What inputs are normally required for an Auto Pilot?
  74. #274 Which of the following is not an accurate list of functions/data recorded by the Vessel Data Recorder?
  75. #275 Which of the following statements about Vessel Data Recorders is NOT true?
  76. #276 What is the best method for grounding an Inmarsat-C terminal?
  77. #277 What is the most important consideration for installing a Full-Duplex VHF radiotelephone.
  78. #278 What is the most important factor when locating depth finder transducers?
  79. #279 Bridge equipment separation recommendations generally refer to what instrument?
  80. #280 When installing an Inmarsat-C antenna what should be the minimum distance to other Inmarsat antennas?
  81. #281 What action must be taken after an Inmarsat-C system is fully installed?
  82. #282 What are the operator’s license requirements for conducting a GMDSS ship station annual inspection?
  83. #283 What log entries are required after passing the annual inspection?
  84. #284 What battery tests are made during the annual inspection?
  85. #285 What is the easiest way to test the Inmarsat-C terminal for proper operation?
  86. #286 After the station has successfully passed the survey what document is issued to the vessel?
  87. #287 Which of the following is NOT a required VHF test during an annual inspection?
  88. #288 A 4 digit multi-meter with an accuracy of 0.15% and 2 counts is set on the 6 volt scale. What range of readings may be expected when measuring a 5 vol...
  89. #289 A 4 digit multi-meter with an accuracy of 0.15% and 2 counts is set on the 60 volt scale. What range of readings may be expected when measuring a 24 v...
  90. #290 What is the most important specification for an R. F. Signal Generator used at VHF frequencies?
  91. #291 A good lab type signal generator for VHF measurements should be able to reduce its output to:
  92. #292 The characteristics of a 10:1 attenuation probe for an oscilloscope is as follows:
  93. #293 In dual-trace oscilloscopes the purpose of the “Mode” control is to:
  94. #294 What type of signals are usually provided by a simple Function Generator?
  95. #295 a SINAD meter consists of a multi-range audio frequency voltmeter:
  96. #296 Which of the following statements about a logic probe is false?
  97. #297 An analog RF wattmeter provides the most accurate reading:
  98. #298 What is the purpose of a deviation meter?
  99. #299 What would be the most likely reason to observe the transmitter output with a spectrum analyzer?

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.