GMDSS Operator/Maintainer License (DB)

The DB confers the operating authority of the DO and the DM (and, by extension, it also confers the operating authority of the PG and MP).

The DO qualifies the holder to operate, and make some basic equipment adjustments to, Global Maritime Distress and Safety System (GMDSS) radio installations. It also confers the operating authority of the MP.

The DM qualifies personnel as GMDSS radio maintainers to perform at sea repair and maintenance of GMDSS equipment. It also confers the operating authority of the PG and MP.

A PG is required to adjust, maintain, or internally repair FCC licensed radiotelephone transmitters in the aviation, maritime, and international fixed public radio services. It conveys all of the operating authority of the MP. It is also required to operate any compulsorily equipped ship radiotelephone station operating with more than 1500 watts of peak envelope power or voluntarily equipped ship and aeronautical (including aircraft) stations with more than 1000 watts of peak envelope power.

A MP is required to operate radiotelephone stations aboard certain vessels that sail the Great Lakes. They are also required to operate radiotelephone stations aboard vessels of more than 300 gross tons and vessels which carry more than six passengers for hire in the open sea or any tidewater area of the United States. They are also required to operate certain aviation radiotelephone stations and certain coast radiotelephone stations.

The testing elements for this license includes Element 1, Element 3, Element 7, and Element 9

Element 1 - Basic radio law and operating practice with which every maritime radio operator should be familiar. To pass, an examinee must correctly answer at least 18 out of 24 questions.

Element 3 - General Radiotelephone. Electronic fundamentals and techniques required to adjust, repair, and maintain radio transmitters and receivers. The exam consists of questions from the following categories: operating procedures, radio wave propagation, radio practice, electrical principles, circuit components, practical circuits, signals and emissions, and antennas and feed lines. To pass, an examinee must correctly answer at least 57 out of 76 questions.

Element 7 - GMDSS Radio Operating Practices. GMDSS radio operating procedures and practices sufficient to show detailed practical knowledge of the operation of all GMDSS sub-systems and equipment. The exam consists of questions from the following categories: general information, narrow band direct printing, INMARSAT, NAVTEX, digital selective calling, and survival craft. To pass, an examinee must correctly answer at least 75 out of 100 questions.

Element 9 - GMDSS Radio Maintenance Practices and Procedures. Requirements set forth in IMO Assembly on Training for Radio Personnel (GMDSS), Annex 5 and IMO Assembly on Radio Maintenance Guidelines for the Global Maritime Distress and Safety System related to Sea Areas A3 and A4. The exam consists of questions from the following categories: radio system theory, amplifiers, power sources, troubleshooting, digital theory, and GMDSS equipment and regulations. To pass, an examinee must correctly answer at least 38 out of 50 questions.

 If you desire the Radar Endorsement for this license, you must complete the element 8 exam.

Element 8 - Ship Radar Techniques. Specialized theory and practice applicable to the proper installation, servicing, and maintenance of ship radar equipment in general use for marine navigation purposes. To pass, an examinee must correctly answer at least 38 out of 50 questions.

If you need more information about the Ship Radar Endorsement, visit the FCC's webpage

Failure to prepare is preparing to fail.
-----John Wooden, Legendary
UCLA Basketball Coach

Only subscribers have access to these tests.


Element 1 - Basic Radio Law and Operating Procedure

Test questions and answers are presented similar to the COLEM tests, Randomized Questions, and a random  Questions and random Answers sample from the complete question pool.

Element 1 COLEM Test 1 Element 1 COLEM Test 2
Element 1 COLEM Test 3 Element 1 COLEM Test 4
Element 1 COLEM Test 5 Element 1 COLEM Test 6

Element 1 Random Questions Test 1 Element 1 Random Questions Test 2
Element 1 Random Questions Test 3 Element 1 Random Questions Test 4
Element 1 Random Questions Test 5 Element 1 Random Questions Test 6

24 random questions and random answers from the complete pool

Element 1 - Basic Radio Law and Operating Procedure Topic Tests - Random Questions

Topic A: Rules and Regulation Practice Test
36 questions covering these topics:
 - Equipment Requirements
- License Requirements
- Watchkeeping
- Logkeeping
- Log Entries
- Miscellaneous Rules and Regulations
 
Topic B: Communications Procedures Practice Test
36 questions covering these topics:
- Bridge-to-Bridge Operations
- Operating Procedures
- Distress Communications
- Urgency and Safety Communications
- GMDSS
 
Topic C: Equipment Operations Practice Test
36 questions covering these topics:
- VHF Equipment Controls
- VHF Channel Selection
- MF-HF Equipment Controls
- MF-HF Frequency & Emission Selection
- Equipment Tests
- Equipment Faults
 
Topic D: Other equipment Practice Test
36 questions covering these topics:
- Antennas
- Power Sources
- EPIRBS
- SARTS
- Survival Craft VHF
- NAVTEX

Element 3 - Electronic fundamentals and techniques

Test questions and answers are presented similar to the COLEM tests, Randomized Questions, and a random  Questions and random Answers sample from the complete question pool.

Element 3 COLEM Test 1 Element 3 COLEM Test 2
Element 3 COLEM Test 3 Element 3 COLEM Test 4
Element 3 COLEM Test 5 Element 3 COLEM Test 6

Element 3 Randomized Questions Test 1 Element 3 Randomized Questions Test 2
Element 3 Randomized Questions Test 3 Element 3 Randomized Questions Test 4
Element 3 Randomized Questions Test 5 Element 3 Randomized Questions Test 6

100 random questions and random answers from the complete pool

Element 3 - Electronic Fundamentals Topic Tests - Random Questions

Topic A:  Principles Practice Test
48 questions covering these topics:
- Electrical Elements
- Magnetism
- Materials
- Resistance, Capacitance & Inductance
- Semi-conductors
- Electrical Measurements
- Waveforms
- Conduction
 
Topic B: Electrical Math Practice Test
60 questions covering these topics:
- Ohm’s Law
- Frequency
- Waveforms
- Power Relationships
- RC Time Constants
- Impedance Networks
- Calculations
 
Topic C: Components Practice Test
60 questions covering these topics:
- Photoconductive Devices
- Capacitors
- Transformers
- Voltage Regulators, Zener Diodes
- SCRs, Triacs
- Diodes
- Transistors
- Light Emitting Diodes
- Devices
 
Topic D:CircuitsPractice Test
24 questions covering these topics:
- R-L-C Circuits
- Op Amps
- Phase Locked Loops (PLLs);  and
- Voltage Controlled Oscillators (VCOs); Mixers
- Schematics
 
Topic E: Digital Logic Practice Test
48 questions covering these topics:
- Types of Logic
- Logic Gates
- Logic Levels
- Flip-Flops
- Multivibrators
- Memory
- Microprocessors
- Counters, Dividers, Converters
 
Topic F: Receivers Practice Test
60 questions covering these topics:
- Receiver Theory
- RF Amplifiers
- Oscillators
- Mixers
- IF Amplifiers
- Filters and IF Amplifiers
- Filters
- Detectors
- Audio & Squelch Circuits
- Receiver Performance
 
Topic G: Transmitters Practice Test
36 questions covering these topics:
- Amplifiers - 1
- Amplifiers - 2
- Oscillators & Modulators
- Resonance - Tuning Networks
- SSB Transmitters
- Technology
 
Topic H: Modulation Practice Test
18 questions covering these topics:
- Frequency Modulation
- SSB Modulation
- Pulse Modulation
 
Topic I: Power Sources Practice Test
12 questions covering these topics:
- Batteries
- Motors & Generators
 
Topic J: Antennas Practice Test
30 questions covering these topics:
- Antenna Theory
- Voltage, Current and Power Relationships
- Frequency and Bandwidth
- Transmission Lines
- Effective Radiated Power
 
Topic K: Aircraft Practice Test
36 questions covering these topics:
- Distance Measuring Equipment
- VHF Omnidirectional Range (VOR)
- Instrument Landing System (ILS)
- Automatic Direction Finding Equipment (ADF) and Transponders
- Aircraft Antenna Systems and Frequencies
- Equipment Functions
 
Topic L: Installation, Maintenance & Repair Practice Test
48 questions covering these topics:
- Indicating Meters
- Test Equipment
- Oscilloscopes
- Specialized Instruments
- Measurement Procedures
- Repair Procedures
- Installation Codes & Procedures
- Troubleshooting
 
Topic M: Communications TechnologyPractice Test
18 questions covering these topics:
- Types of Transmissions
- Coding and Multiplexing
- Signal Processing, Software and Codes
 
Topic N: Marine Practice Test
30 questions covering these topics:
- VHF
- MF-HF, SSB-SITOR
- Survival Craft Equipment: VHF, SARTs & EPIRBs
- FAX, NAVTEX
- NMEA Data
 
Topic O: Radar Practice Test
30 questions covering these topics:
- RADAR Theory
- Components
- Range, Pulse Width & Repetition Rate
- Antennas & Waveguides
- RADAR Equipment
 
Topic P: Satellite Practice Test
24 questions covering these topics:
- Low Earth Orbit Systems
- INMARSAT Communications Systems-1
- INMARSAT Communications Systems-2
- GPS
 
Topic Q: Safety Practice Test
 
12 questions covering these topics:
- Radiation Exposure
- Safety Steps

 


Element 7 - GMDSS Radio Operating Practices

Test questions and answers are presented similar to the COLEM tests, Randomized Questions, and a random  Questions and random Answers sample from the complete question pool.

Element 7 Practice Test 1 Element 7 Practice Test 2
Element 7 Practice Test 3 Element 7 Practice Test 4
Element 7 Practice Test 5 Element 7 Practice Test 6

Element 7 Topic Tests - Random Ordered Questions

Topic A: General Information and System Overview Practice Test
36 questions covering these topics:
- Fundamental Concepts
- Equipment Systems
- Sea Areas
- Functional Requirements
- Carriage Requirements
- Maintenance Options
 
Topic B:  Principles of Communications Practice Test
36 questions covering these topics:
- Radio Spectrum
- Frequency Bands
- Modulation, Demodulation, AM, FM
- Carrier and Sidebands
- Channel Spacing
- Antennas
 
Topic C:  F.C.C. Rules & Regulations Practice Test
48 questions covering these topics:
- Inspections and Exemptions
- Required Documents and Publications Maintenance
- License and Personnel Requirements
- Reserve Source of Energy
- Equipment Testing
- Watchkeeping
- Logkeeping
 
Topic D: DSC & Alpha-Numeric ID Practice Test
48 questions covering these topics:
- Call Signs and SELCALs
- MMSI- MID and Ship Station I.D. Numbers
- MMSI; Group and Coast Station I.D. Numbers
- Inmarsat Mobile Numbers for B & F-77 Terminals
- Inmarsat Mobile Numbers for “C” Terminals
- DSC Format and Info Sent
- DSC Operations
- DSC Frequencies
 
Topic E: Distress, Urgency & Safety Communications Practice Test
60 questions covering these topics:
- Sending a Distress Alert
- Follow-On Voice Transmission
- Response to a Distress Alert
- Distress Relays
- Action-False Distress Alert
- Radio Silence – Resume Traffic
- Urgency Traffic
- Safety Traffic
- Frequencies
- Other Procedures
 
Topic F: Survival Craft Equip & S.A.R. Practice Test
60 questions covering these topics:
- SART- Activation and Survival Craft Operation
- SART – Radar Display – SAR – AIS SART
- SART: Testing and Battery Parameters
- EPIRB System Structure and Operation
- EPIRB Alerting and Features
- Homing and Locating Signals
- Survival Craft Transceivers
- On Scene Communications
- SAR-MCC-RCC: Systems & Procedures-1
- SAR-MCC-RCC: Systems & Procedures-2
 
Topic G: VHF-DSC Equipment & Communications Practice Test
12 questions covering these topics:
- VHF Controls, Power and Range
- VHF Channel System
 
Topic H: Maritime Safety Information (M.S.I.) Practice Test
48 questions covering these topics:
- Navtex-1: Operations
- Navtex-2: Programming
- Navtex-3: Message Format
- SafetyNETTM -1: Operations
- SafetyNETTM -2: Information
- Enhanced Group Calling (EGC)
- H.F. MSI
- NAVAREAs
 
Topic Ia: Inmarsat Equipment and Comms Practice Test 1
30 questions covering these topics:
- Sat-C, Power up, Self-Test, Controls & Lamps
- Selecting an Inmarsat Ocean Region
- Inmarsat Log-in & Log-out
- Inmarsat General System Operations-1
- Inmarsat General System Operations-2
 
Topic Ib: Inmarsat Equipment and Comms Practice Test 2
48 questions covering these topics:
- Inmarsat-B or F77 Equipment and Operations
- Inmarsat-C: Equipment and Operations-1
- Inmarsat-C: Equipment and Operations-2
- Compare and Differentiate “B” and “C” Terminals
- Selecting L.E.S. and L.E.S. ID Numbers
- Inmarsat-B and F77- Address, Dialing and Voice
- Inmarsat-B - Address, Dialing and Telex
- Inmarsat-C Address to Ship Telex
 
Topic Ic: Inmarsat Equipment and Comms Practice Test 3
 48 questions covering these topics:
- Address to Land Telex Terminal
- Address to a FAX Terminal
- Address to Internet, SMS or Special Addresses
- Inmarsat Distress Communications
- Satellite SAR-MCC-RCC
- EGC
- Equipment Faults and Maintenance-1
- Equipment Faults and Maintenance-2
 
Topic Ja: MF-HF Equipment and Comms Practice Test 1
 36 questions covering these topics:
- MF-HF Panel Controls
- MF-HF Frequency–Simplex, Duplex, Half-Duplex
- MF-HF ITU Channels
- MF-HF Voice and Telex Channel Separation
- MF-HF Modulation, Bandwidth and Emissions
- MF-HF Voice Operations–Calling a Coast Station
 
Topic Jb: MF-HF Equipment and Comms Practice Test 2
48 questions covering these topics:
- MF-HF DSC Controller Call Programming
- MF-HF SITOR (NBDP) - Definitions
- MF-HF SITOR (NBDP) Technical Characteristics
- MF-HF ARQ Operation – Calling a Coast Station
- MF-HF ARQ Operation - Answerbacks
- MF-HF ARQ Operation – OP Codes & Procedures
- MF-HF ARQ Operation–Technical Characteristics
- MF-HF Addressing Modes
 
Topic Jc: MF-HF Equipment and Comms Practice Test 3
 42 questions covering these topics:
- MF-HF FEC Operation-1
- MF-HF FEC Operation-2
- MF-HF Propagation-1; Day-Night-Winter-Summer
- MF-HF Propagation-2; Day-Night-Winter-Summer
- MF-HF DSC Controller Alert/Call Response
- Batteries
- MF-HF Equipment Faults and Testing

 


Element 9 - GMDSS Radio Maintenance Practices and Procedures.

Element 9 Practice Test 1 Element 9 Practice Test 2
Element 9 Practice Test 3 Element 9 Practice Test 4
Element 9 Practice Test 5 Element 9 Practice Test 6

Element 9 - Topic Tests - Random Ordered Questions

Topic A: VHF-DSC Equipment and Operation Practice Test
60 questions covering these topics:
- Frequency and Bandwidth
- Controls and Functions
- Receiver Technology
- Receiver Faults-1
- Receiver Faults-2
- Transmitter Technology
- Transmitter Faults-1
- Transmitter Faults-2
- Digital Selective Calling
- Antenna Systems
 
Topic B: MF-HF-DSC-SITOR (NBDP) Equipment and Operations Practice Test
72 questions covering these topics:
- Frequencies and Bandwidth
- Controls, Functions and Displays
- Receiver Technology
- Receiver Faults-1
- Receiver Faults-2
- Transmitter Techmology
- Transmitter Faults-1
- Transmitter Faults-2
- DSC Operations
- SITOR (NBDP)-ARQ
- SITOR (NBDP)-FEC
- Antenna Systems
 
Topic C: Satellite Systems Practice Test
60 questions covering these topics:
- Technology
- C-Terminals
- Long Range Identity Tracking
- MF-HF Frequency & Emission Selection
- Fleet-33-55-77 Terminals
- Fleet Broadband Terminals
- GPS
- Antenna Systems
- Equipment Faults and troubleshooting-1
- Equipment Faults and troubleshooting-2
- Equipment Faults and troubleshooting-3
 
Topic D: Other GMDSS Equipment Practice Test
24 questions covering these topics:
- EPIRB
- SART
- Survival Craft Transceiver
- Navtex
 
Topic E: Power Sources Practice Test
24 questions covering these topics:
- Batteries
- Battery Chargers and Power Sources
- Power Supplies-1
- Power Supplies-2
 
Topic F: Other Equipment and Networks Practice Test
36 questions covering these topics:
- Computers
- Computer Networks – Ethernet
- Local Area Networks- NMEA-0183
- Local Area Networks- NMEA-2000
- Depth Finders, Gyro Compass, SSAS, AIS
- ECDIS – Auto Pilots – Data Recorders
 
Topic G: Inspections, Installations and Instruments Practice Test
-  24 questions covering these topics:
- Equipment Installation
- Annual Inspections
- Test Equipment-1
- Test Equipment-2

Element 8 - Radar Systems Tests

Test questions and answers are presented similar to the COLEM tests, Randomized Questions, and a random  Questions and random Answers sample from the complete question pool.

Element 8 COLEM Test 1 Element 8 COLEM Test 2
Element 8 COLEM Test 3 Element 8 COLEMTest 4
Element 8 COLEM Test 5 Element 8 COLEM Test 6

Element 8 Randomized Questions Test 1 Element 8 Randomized Questions Test 2
Element 8 Randomized Questions Test 3 Element 8 Randomized Questions Test 4
Element 8 Randomized Questions Test 5 Element 8 Randomized Questions Test 6

50 random questions and random answers from the complete pool

Element 8 - Radar System Topic Tests - Random Questions

Topic A: RADAR Principles Practice Test
60 questions covering these topics:
- Marine RADAR Systems
- Distance and Time
- Frequency and Wavelength
- Power, Pulse Width, PRR
- Range, Pulse Width, PRF
- Pulse Width - Pulse Repetition Rates
- Components-1
- Components-2
- Circuits-1
- Circuits-2
 
Topic B: Transmitting Systems Practice Test
48 questions covering these topics:
- Transmitting Systems
- Magnetrons
- Modulation
- Pulse Forming Networks Modulation
- TR - ATR - Circulators - Directional Couplers-1
- TR - ATR - Circulators - Directional Couplers-2
- Timer - Trigger - Synchronizer Circuits
 
Topic C: Receiving Systems Practice Test
60 questions covering these topics:
- Receiving Systems
- Mixers
- Local Oscillators
- Amplifiers
- Detectors - Video Amplifiers
- Automatic Frequency Control - AFC
- Sea Clutter - STC
- Power Supplies
- Interference Issues
- Miscellaneous
 
Topic D: Display & Control Systems Practice Test
60 questions covering these topics:
- Displays
- Video Amplifiers and Sweep Circuits
- Timing Circuits
- Fixed Range Markers
- Variable Range Markers
- EBL, Azimuth and True Bearing
- Memory Systems
- ARPA - CAS
- Display System Power Supplies
- Miscellaneous
 
Topic E: Antenna Systems Practice Test
30 questions covering these topics:
- Antenna Systems
- Transmission Lines
- Antenna to Display Interface
- Waveguides-1
- Waveguides-2
 
Topic F: Installation, Maintenance & Repair Practice Test
42 questions covering these topics:
- Equipment Faults-1
- Equipment Faults-2
- Equipment Faults-3
- Equipment Faults-4
- Maintenance
- Installation
- Safety