100+ Free FCC GMDSS Maintainer Practice Questions

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Question 1

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What is the most common cause of distortion in a class-C RF power amplifier when used for SSB transmission?

Excessive input filtering

Loose ground straps in the cabinet

Class-C amplifiers are non-linear and unsuitable for SSB; class A, AB, or linearized stages are required

Class C is highly linear by design

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2026 Statistics

Key Facts: FCC GMDSS Maintainer Exam

174

Total Questions (Elements 1+3+9)

FCC Element pools

75%

Element 1 & Element 3 Passing

FCC scoring rules

76%

Element 9 Passing (38/50)

FCC scoring rules

~$100–$175

Typical COLEM Element Fees

COLEM pricing

Lifetime

License Term

FCC since 2008

Online OK

Remote Testing Available

Multiple COLEMs

The FCC GMDSS Radio Maintainer's License (DM) is the maintenance-focused FCC marine credential. It requires passing Element 1 (Basic Radio Law, 24 questions, 18/24 to pass), Element 3 (General Radiotelephone electronics, 100 questions, 75/100 to pass), and Element 9 (GMDSS Radio Maintenance Practices and Procedures, 50 questions, 38/50 to pass) — 174 questions total. The DM is administered by FCC-authorized COLEMs, often available with online proctoring. Typical end-to-end cost is approximately $100–$175 across elements plus a $35 FCC fee. The license is issued for the holder's lifetime and is the credential needed for at-sea electronic maintenance under SOLAS Chapter IV availability rules.

Sample FCC GMDSS Maintainer Practice Questions

Try these sample questions to test your FCC GMDSS Maintainer exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which FCC element covers basic radio law and operating practice for all commercial radio operator candidates?

A.Element 3

B.Element 1

C.Element 7

D.Element 9

Explanation: FCC Element 1 (Basic Radio Law and Operating Practice) is the foundational 24-question exam required for nearly all commercial radio operator licenses, including the GMDSS Radio Maintainer's License (DM). A score of 18 out of 24 (75%) is required to pass.

2Under FCC Part 80 rules, which entity authorizes the operation of a ship radio station in the United States?

A.The United States Coast Guard

B.The Federal Communications Commission

C.The International Maritime Organization

D.The National Maritime Center

Explanation: The FCC issues both the ship station license (authorizing the radio installation) and the commercial operator licenses authorizing individuals to operate or maintain the equipment. The USCG enforces SOLAS carriage at the safety level but does not license radio stations.

3How many questions must be answered correctly to pass FCC Element 1?

A.16 out of 24

B.18 out of 24

C.20 out of 24

D.22 out of 24

Explanation: FCC Element 1 requires 18 correct answers out of 24 questions (75%) to pass. Both Element 1 and the elements specific to the GMDSS Maintainer (DM) license use a 75% threshold.

4An ITU Radio Regulations distress call has absolute priority over all other transmissions. What is the international VHF distress channel?

A.Channel 13

B.Channel 16

C.Channel 70

D.Channel 22A

Explanation: VHF Channel 16 (156.800 MHz) is the international voice distress, safety and calling channel under the ITU Radio Regulations. Channel 70 is reserved for DSC alerting only and must not be used for voice traffic.

5Who is responsible for the proper maintenance of station records aboard a compulsorily equipped ship station?

A.The licensed maintainer only

B.The master or person responsible for the vessel

C.The FCC field inspector

D.The COLEM that issued the license

Explanation: Under 47 CFR Part 80, the master or person responsible for the ship station is responsible for ensuring that radio logs and records are properly maintained, even when a licensed radio operator or maintainer performs the entries.

6What is the ITU-defined silent period for the international VHF distress channel?

A.There is no silent period on VHF Channel 16

B.Three minutes after each hour and half-hour

C.Five minutes after each hour

D.One minute every fifteen minutes

Explanation: VHF Channel 16 has no scheduled silent periods. The traditional three-minute silent periods (H+00 and H+30) applied to the 2182 kHz MF voice distress frequency, which has largely been superseded by DSC under GMDSS.

7Which document provides the international frequency allocations binding on FCC licensees?

A.The SOLAS Convention

B.The ITU Radio Regulations

C.The IMO STCW Code

D.The IALA Buoyage Guide

Explanation: The ITU Radio Regulations, maintained by the International Telecommunication Union, contain the binding international frequency allocations. The FCC's domestic Part 2 table of frequency allocations conforms to the ITU table.

8What is the maximum penalty under the Communications Act for willfully and knowingly transmitting a false distress signal?

A.A written warning only

B.Fines and imprisonment, including up to a $250,000 fine and/or imprisonment

C.Loss of operator license only

D.Revocation of ship station license only

Explanation: Transmitting false distress signals is a federal felony under the Communications Act. Penalties include substantial fines (commonly cited at up to $250,000) and possible imprisonment, plus the cost of recovering search-and-rescue resources.

9Under FCC rules, who may make adjustments to the transmitting equipment of a compulsory ship station?

A.Anyone aboard who has read the manual

B.Only the holder of a commercial operator license of the appropriate class

C.Only a representative of the equipment manufacturer

D.Only the captain of the vessel

Explanation: Only an appropriately licensed commercial radio operator may make adjustments to a transmitter aboard a compulsorily equipped vessel. For GMDSS maintenance at sea, a DM or DB license is required.

10Which signal indicates a message about the safety of navigation or important meteorological warnings?

A.MAYDAY

B.PAN-PAN

C.SECURITE

D.SEELONCE FINI

Explanation: SECURITE (pronounced 'say-cure-e-tay') announces a safety message such as a navigational hazard or weather warning. MAYDAY indicates distress, PAN-PAN indicates urgency, and SEELONCE FINI lifts radio silence after a distress incident.

About the FCC GMDSS Maintainer Exam

The FCC GMDSS Radio Maintainer's License (DM) authorizes the holder to perform at-sea repair and maintenance of Global Maritime Distress and Safety System (GMDSS) equipment on SOLAS vessels. It is the maintenance-focused FCC commercial radio credential — distinct from the operator-only GMDSS Radio Operator's License (DO) — and requires passing FCC Elements 1, 3, and 9. Holders may also operate GMDSS equipment with the same authority as the DO and MROP. Issued for the lifetime of the holder.

Assessment

Three written elements administered by an FCC-approved COLEM: Element 1 (24 questions, 18/24 to pass), Element 3 (100 questions, 75/100 to pass), and Element 9 (50 questions, 38/50 to pass). Elements may be taken in the same session or across separate sessions.

Time Limit

Set per element by the COLEM session

Passing Score

75% Element 1; 75% Element 3; 76% Element 9

Exam Fee

Approximately $100–$175 total across three elements via COLEM, plus a $35 FCC application fee (Federal Communications Commission (FCC) via COLEMs)

FCC GMDSS Maintainer Exam Content Outline

24 questions

Element 1 – Basic Radio Law

FCC Part 80 maritime regulations, ITU Radio Regulations, distress/urgency/safety procedures, false-alert cancellation, MMSI, station records, and operator authority on compulsory ship stations.

100 questions

Element 3 – General Radiotelephone

DC/AC theory, Ohm's Law, semiconductors, transmitter/receiver architecture, AGC, oscillators, modulation (AM, SSB, FM), antennas, transmission lines, SWR, decibels, test instruments, and repair/maintenance fundamentals.

50 questions

Element 9 – GMDSS Maintenance Practices

GMDSS Sea Areas A1–A4, DSC alerting on VHF/MF/HF, 406 MHz EPIRBs and Cospas-Sarsat, radar SARTs, NAVTEX, Inmarsat-C and EGC SafetyNET, reserve battery rules, duplication and shore-based maintenance methods, and troubleshooting GMDSS equipment at sea per IMO Annex 5.

How to Pass the FCC GMDSS Maintainer Exam

What You Need to Know

Passing score: 75% Element 1; 75% Element 3; 76% Element 9
Assessment: Three written elements administered by an FCC-approved COLEM: Element 1 (24 questions, 18/24 to pass), Element 3 (100 questions, 75/100 to pass), and Element 9 (50 questions, 38/50 to pass). Elements may be taken in the same session or across separate sessions.
Time limit: Set per element by the COLEM session
Exam fee: Approximately $100–$175 total across three elements via COLEM, plus a $35 FCC application fee

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

FCC GMDSS Maintainer Study Tips from Top Performers

1Treat Element 3 as your largest study block: drill Ohm's Law, reactance, resonance, dB, and SWR calculations until they are automatic.

2Memorize emission designators (J3E for SSB, F3E for marine VHF, G3E) and which is used on which marine service.

3Know each GMDSS Sea Area (A1, A2, A3, A4) by the equipment that defines it (VHF DSC, MF DSC, Inmarsat geostationary, and HF for polar regions).

4Learn the three SOLAS availability methods — duplication, shore-based maintenance, and at-sea electronic maintenance — and remember that A3/A4 vessels need at least two of them.

5Master EPIRB and SART specs: 406 MHz EPIRB, 9 GHz SART with 12 blips, 96-hour standby plus 8-hour response battery endurance.

6Practice safe troubleshooting habits: dummy load before keying, GDT lightning protection, one-hand-in-pocket AC mains technique, and respect for stored high-voltage capacitor charge.

7Cycle full-length practice sets across all three elements so you can hold radio-law, electronics, and GMDSS facts in mind simultaneously on test day.

8Read the FCC published Element 3 and Element 9 question pools — actual COLEM exams draw directly from these pools.

Frequently Asked Questions

What is the difference between the FCC GMDSS Maintainer (DM) and Operator (DO) licenses?

The GMDSS Radio Operator's License (DO) authorizes operation of GMDSS equipment and requires Elements 1 + 7. The GMDSS Radio Maintainer's License (DM) authorizes at-sea repair and maintenance of GMDSS equipment and requires Elements 1 + 3 + 9. Vessels using at-sea electronic maintenance for SOLAS availability typically need a DM or DB holder on board.

How many questions and how many elements are on the GMDSS Maintainer exam?

The DM requires three FCC elements totaling 174 questions: Element 1 (24 questions, 18/24 to pass), Element 3 (100 questions, 75/100 to pass), and Element 9 (50 questions, 38/50 to pass). They are administered by FCC-authorized COLEMs and may be taken in one session or across multiple sessions.

How much does the FCC GMDSS Maintainer (DM) exam cost?

Per-element COLEM fees vary but typically total approximately $100–$175 for all three elements combined, plus a $35 FCC application fee at license issuance. Online-proctored options and bundled pricing are available from several COLEMs.

Where can I take the FCC GMDSS Maintainer exam?

Exams are administered by FCC-authorized COLEMs (Commercial Operator License Examination Managers) such as Mariners Learning System, Exemplar Global, ETA International, and Elkins International. Many COLEMs offer online proctored testing as well as in-person sessions.

How long is the FCC GMDSS Maintainer (DM) license valid?

Commercial radio operator licenses, including the DM, are issued for the lifetime of the holder. No renewal is required, although your underlying maritime credentials and any flag-state qualifications follow their own renewal cycles.

Is online testing available for the GMDSS Maintainer exam?

Yes. Several COLEMs offer online proctored sessions for FCC commercial radio operator elements, including Elements 1, 3, and 9. Specific scheduling, ID, and proctoring requirements vary by COLEM.

What does Element 9 cover that Element 7 does not?

Element 7 covers GMDSS operating practices for the DO license. Element 9 covers GMDSS Radio Maintenance Practices and Procedures — radio system theory, amplifiers, power sources, troubleshooting, digital theory, and GMDSS equipment and regulations aligned with IMO Annex 5 for shipboard maintainers.