GMDSS Operators License (DO)

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.

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 General Radio Operators License test comprises of element 1 and element 7.

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 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.

For more information concerning the qualifications and terms of licenses, visit the FCC's GMDSS Operator License webpage

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

Only subscribers have access to these tests.

Untitled 1

Element 1

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

Element 1 Topic Tests - Random Ordered 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

Untitled 1

Element 7

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
& nbsp;   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

page updated 9/29/2013