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Chapter 1A of 21
Rules & Regulations
Equipment Requirements and Certification
Any transmitter used aboard a U.S. vessel has to be certified by the FCC for Part 80 operations. Coast Guard approval doesn't count. Neither does IMO approval or the manufacturer's own testing. Unless the rules carve out a specific exception, only FCC-certified gear is allowed.
Standard VHF marine radios transmit F3E (FM voice), and their carrier power is capped at 25 watts. That's the limit for the VHF sets you'll find on nearly every recreational and commercial boat.
MF transmitters on compulsorily fitted vessels go the other way: the FCC sets a minimum, and it's at least 60 watts PEP (peak envelope power).
Extra Equipment the Farther You Go
A small passenger vessel that sails 20 to 150 nautical miles from the nearest land needs an MF-HF SSB transceiver on top of its VHF. VHF only reaches to about the horizon, so a boat that far out needs MF or HF to reach a shore station.
Digital Selective Calling (DSC)
The DSC controller is the equipment you program to send distress alerts and to call individual stations. Press the distress button and it sends a formatted digital alert with your vessel's identity, plus your position if it's connected to GPS. It takes most of the work out of raising the alarm.
Don't mix it up with NAVTEX. NAVTEX only receives maritime safety broadcasts. It can't send a distress alert.
Commercial Radio Operator Licensing
The FCC issues several kinds of commercial operator licenses, and the exam expects you to know which one covers which job.
Ship RADAR Stations
You don't need any operator license to run a fixed-tuned ship RADAR with external controls. Shipboard RADAR operation isn't licensed at the operator level.
Aircraft Communications
To operate on frequencies below 30 MHz that aren't reserved exclusively for aeronautical mobile service, you need at least a Marine Radio Operator Permit. In practice, this means the HF frequencies that maritime and aeronautical users share.
GMDSS Operator Requirements
A passenger ship with a GMDSS installation must carry two operators who each hold a GMDSS Radio Operator License or a Restricted GMDSS Radio Operator License. Which one depends on the sea areas the ship sails in.
Great Lakes Radio Agreement
Ships covered by the Great Lakes Radio Agreement need an operator holding at least a Marine Radio Operator Permit.
Eligibility and Displaying Your License
If you can't send and receive spoken messages correctly in English by telephone, you can't be issued a commercial radio operator license.
When you're on duty and in charge of a transmitter, your original license or a photocopy must be posted or on you, ready for inspection.
💡 It has to be within your own reach. A copy kept by your supervisor or filed with the station records doesn't satisfy the rule.
Radio Watch Requirements
Channel 16 Watch
Every compulsory-equipped vessel must keep a continuous watch on VHF Channel 16 while underway at sea. Channel 16 (156.800 MHz) is the international distress, safety and calling channel.
The Channel 16 rules break down like this:
- •The watch is required at all times at sea, unless the vessel is in a VTS system.
- •In sea area A1, a vessel that falls under the Bridge-to-Bridge Act and is in a VTS system can skip Ch-16, as long as it monitors both Ch-13 and the VTS channel.
- •In sea areas A2, A3 and A4 there are no exceptions. The watch is always required.
2182 kHz Watch
Compulsory-equipped cargo ships navigating outside a harbor or port must keep a continuous radiotelephone watch on both 2182 kHz and Channel 16. The exceptions are ships operating under GMDSS rules and ships in a VTS.
Whenever you're required to watch 2182 kHz, you must also observe the 3-minute silent periods starting at 00 and 30 minutes past each hour. You don't transmit during them. You listen for anyone in distress.
DSC Watchkeeping
The DSC watch covers these bands and channels:
- •VHF Channel 70
- •2 MHz MF DSC
- •8 MHz HF DSC
- •1 other HF DSC frequency
Station Logs
Compulsory radio stations are legally required to keep logs. You need to know what goes in the log, how to fix a mistake, and how long to keep it.
Who Keeps the Log
- •Entries are made by the operator responsible for operating or maintaining the station.
- •Responsibility for keeping it properly is shared by the station licensee and the radio operator in charge of the station.
Where the Log Is Kept
During a voyage, the ship station log stays at the principal radiotelephone operating position. The GMDSS radio log stays at the GMDSS operating position.
What Goes in the Log
Every entry needs:
- •The station, date and time
- •The name of the operator on duty
- •The call signs of the stations you communicated with
You also have to record:
- •A summary of all required Distress traffic heard, and any Urgency traffic affecting your own ship
- •Safety traffic affecting your own ship, except on VHF
- •Pre-voyage, pre-departure and daily equipment tests
- •The vessel's daily position
- •When each radio operator goes on and off watch
That VHF exception matters. Tests, Distress traffic and Urgency traffic always get logged, but VHF Safety (SÉCURITÉ) calls specifically don't have to be.
⚠️ Exam Trap: The VHF Logging Exception
The exam likes to ask which safety transmissions you have to log.
EPIRB tests are normally logged once a month.
You're allowed to use key letters or abbreviations in a GMDSS Radio Logbook, as long as their meaning is written down in the log.
Correcting a Log Entry
If you make a mistake in the log:
- 1.The person who made the original entry strikes it out
- 2.They initial the correction
- 3.They write the date of the correction
Never erase anything. No white-out, and no rewriting the page. The original entry has to stay readable with a line through it.
How Long to Keep Logs
| Log Type | Keep It For | Notes |
|---|---|---|
| Standard station log | 2 years | No distress entries recorded |
| Distress / disaster log | 3 years | Longer if the FCC is reviewing it |
Regulations and Control
Which Rules Apply
A U.S. ship station in international waters is governed by Part 80 of the FCC Rules plus the international Radio Regulations and agreements the United States has signed, such as the ITU Radio Regulations and international treaties.
Who's in Charge
The master of the ship has final say over the ship's radio station. That authority outranks any radio operator or officer aboard.
A licensed operator can let an unlicensed person talk on the radio, but only while the licensed operator supervises. The licensed operator is still responsible for the station the whole time.
Where the Radio Goes
The principal radiotelephone operating position must be in the room the ship is normally steered from at sea, or the room next to it. That's usually the wheelhouse or bridge, so whoever is conning the ship can reach the radio.
Which Ships Must Carry Radio
Under the SOLAS Convention, these ships must carry radio equipment for safety of life at sea:
- •Cargo ships over 300 gross tons
- •Vessels carrying more than 12 passengers
Cross either line and compulsory radio carriage kicks in.
GMDSS Inspection
To get a ship's GMDSS radio station inspected, apply to the Engineer-in-Charge of the FCC District Office closest to where the inspection will happen.
Sample Questions
10 questions drawn from across the course. Pick an answer for each, then check your score.
1.What is a requirement of all marine transmitting apparatus used aboard United States vessels?
2.What traffic management service is operated by the U.S. Coast Guard in certain designated water areas to prevent ship collisions, groundings and environmental harm?
3.What is the purpose of the INT-USA control settings on a VHF?
4.What are the antenna requirements of a VHF telephony coast, maritime utility or ship station?
5.The product of the readings of an AC voltmeter and AC ammeter is called:
6.What value of series resistor would be needed to obtain a full scale deflection on a 50 microamp DC meter with an applied voltage of 200 volts DC?
7.What happens to the conductivity of photoconductive material when light shines on it?
8.What is the approximate magnitude of the impedance of a parallel R-L-C circuit at resonance?
9.What is the voltage range considered to be valid logic low input in a TTL device operating at 5 volts?
10.What is the limiting condition for sensitivity in a communications receiver?
Answer all 10 questions to see your score.
What's in the full course
- 📖 All 21 study chapters
- ✏️ All 738 questions, with answers and references
- ⏱️ Timed mock exams that match the real test
- 1ARules & Regulations
- 1BOperating Procedures
- 1CRadio Equipment and Operations
- 1DGMDSS Equipment and Safety Systems
- 3APrinciples
- 3BElectrical Math
- 3CComponents
- 3DCircuits
- 3EDigital Logic
- 3FReceivers
- 3GTransmitters
- 3HModulation
- 3IPower Sources
- 3JAntennas
- 3KAircraft
- 3LInstallation, Maintenance & Repair
- 3MCommunications Technology
- 3NMarine
- 3ORADAR
- 3PSatellite
- 3QSafety