FCC MMSI registration takes one of two paths: recreational boaters staying in U.S. waters can get a free domestic Maritime Mobile Service Identity from an FCC-authorized private registrant, while any vessel that travels to foreign ports or makes international communications must file for a Ship Station License directly with the FCC. Either way, the nine-digit MMSI has to be programmed into your DSC radio or AIS transponder before you transmit. Self-assigning a number is prohibited, and transmitting without a properly assigned MMSI violates federal rules.1Federal Communications Commission. Enforcement Advisory No. 2016-04 – Marine Radio
Who Needs an MMSI
If your vessel carries any radio with DSC capability, an AIS transponder, or an Inmarsat satellite terminal, you need an MMSI before you key the mic.2Federal Communications Commission. Maritime Mobile Service Identities – MMSI Each vessel gets one MMSI, and every DSC and AIS device aboard shares that same number. When you press the distress button on a DSC radio, the system broadcasts your MMSI along with your GPS position if the radio is connected to a GPS source, letting the Coast Guard pull up your vessel and emergency contact information immediately.
A ship station does not need an individual FCC license if it meets all three of these conditions: it is not required by law to carry a radio, it does not travel to foreign ports, and it does not make international communications.3eCFR. 47 CFR Part 80 Subpart B – Applications and Licenses Most recreational boaters staying in U.S. waters fit that description. They still need the MMSI. They just do not need a full FCC license to get one.
Domestic MMSI or Ship Station License
Picking the wrong path is the single most common mistake in this process. The domestic route is faster and free. The FCC route costs $35 and takes a few days. What actually decides the question is where you plan to go.
Domestic MMSI
If your vessel stays in U.S. waters and never communicates with foreign stations, you can get a domestic MMSI from one of the FCC’s authorized private registrants: BoatUS, Sea Tow, Shine Micro, or the United States Power Squadrons.1Federal Communications Commission. Enforcement Advisory No. 2016-04 – Marine Radio BoatUS provides the MMSI free to members and charges $25 for non-members, with eligibility limited to recreational vessels under 65 feet.4BoatUS. Get Your MMSI Registration Today
Domestic MMSIs do not end in zero. Only MMSIs ending in zero are accepted into the International Telecommunication Union (ITU) database, so a domestic number is invisible to search and rescue authorities outside the United States.5Navigation Center. MMSI Frequently Asked Questions If you later decide to cruise to the Bahamas or Canada, you will need to cancel the domestic MMSI and obtain a new one from the FCC.
Ship Station License
Any vessel that travels to foreign ports or makes international communications must hold an individual Ship Station License issued directly by the FCC.2Federal Communications Commission. Maritime Mobile Service Identities – MMSI This license assigns an MMSI ending in zero, which the FCC reports to the ITU’s Maritime mobile Access and Retrieval System (MARS) and the Coast Guard’s Port State Information Exchange (PSIX). Both domestic and foreign rescue authorities can then look up your vessel if you send a distress signal. The license is valid for ten years and also gives your vessel a call sign for voice communications with foreign stations.3eCFR. 47 CFR Part 80 Subpart B – Applications and Licenses
How to Apply for a Ship Station License
The application runs through the FCC’s Universal Licensing System (ULS). Three steps.
Get an FCC Registration Number
Before filing anything, you need a 10-digit FCC Registration Number (FRN) from the Commission Registration System (CORES).6Federal Communications Commission. Commission Registration System The FRN ties to you personally and is used for all FCC applications and payments. If you already have one from a previous license, such as amateur radio, reuse it.
File FCC Form 605
Log into the ULS, select the Ship Radio Service, and choose the license type. Most recreational boaters select “SA – Ship Recreational or Voluntarily Equipped.”7Federal Communications Commission. Ship Radio Stations Licensing Form 605 Schedule B collects vessel details: name, state registration number or Coast Guard documentation number, gross tonnage, the location of your main radio, and emergency contact information. In Question 11, indicate that you want a new MMSI assigned.2Federal Communications Commission. Maritime Mobile Service Identities – MMSI
Pay the Fee
The application fee for a new Ship Station License is $35, and renewal costs the same.8Federal Register. Schedule of Application Fees Processing typically takes a few days. Once granted, the FCC posts your electronic authorization in the ULS for download. Paper licenses are no longer mailed, so check the system.
Handheld VHF Radios Need a Different Format
A portable VHF radio that moves between vessels does not get the same MMSI as a fixed-mount radio tied to one boat. The FCC treats these as portable ship stations and assigns them a specially formatted handheld MMSI beginning with “8” rather than the standard “3” prefix used for U.S. vessel MMSIs.9Federal Communications Commission. VHF Handheld Stations
You file the same FCC Form 605 through the ULS, but you must include an attachment specifically requesting the handheld-formatted MMSI. Skip this attachment and the FCC will issue a standard ship station MMSI, which is a headache to fix because radios limit how many times you can reprogram the number. The handheld license also runs for ten years.9Federal Communications Commission. VHF Handheld Stations
Operator Permit for International Voyages
The Ship Station License is not the only credential you need for international waters. At least one person aboard must hold a Restricted Radiotelephone Operator Permit (RR) when the vessel travels to foreign ports or makes international communications. If you never leave U.S. waters and only operate on VHF frequencies, the permit is not required. The RR is issued for the holder’s lifetime and does not need renewal.10Federal Communications Commission. Commercial Radio Operator Types of Licenses File both applications before your first international trip.
Program the MMSI Carefully
Most DSC radios allow you to enter an MMSI only once or twice before the unit locks permanently and refuses further attempts. This is an FCC-mandated security feature to prevent unauthorized reprogramming. If the radio locks, you will need to send it to the manufacturer’s service center for a factory reset, which can cost around $40 and leave you without a radio for days or weeks.11Uniden Support. MMSI Registration Information
Have your MMSI confirmed and in hand before you touch the programming menu. Double-check every digit.
Connect Your Radio to GPS
A DSC distress alert only includes your position if the radio has a built-in GPS or is connected to an external GPS receiver.12Navigation Center. DSC Distress Without that connection, the Coast Guard receives your MMSI and vessel details but no coordinates. The GPS hookup is the step that makes the whole registration worth doing.
Keeping Your Record Current
Your MMSI registration is only as useful as the information behind it. Old phone numbers or a previous owner’s name in the record delay the response when it counts. Changes to your contact information, vessel name, or other details go through an Administrative Update in the ULS, and updates are free.
When you sell a vessel, the previous owner must contact the FCC to cancel the Ship Station License. After cancellation, the new owner can file a fresh Form 605 application and request the same MMSI number for the vessel.2Federal Communications Commission. Maritime Mobile Service Identities – MMSI If you hold a domestic MMSI through BoatUS or another registrant, contact that organization directly to handle the transfer.5Navigation Center. MMSI Frequently Asked Questions
Selling a radio without the vessel is different. You cannot transfer the MMSI registration to the buyer. Delete the MMSI from the hardware before the sale. ITU regulations require you to contact the radio manufacturer for the specific deletion procedure, which varies by model. Some radios clear with a code; others need to be shipped back to the manufacturer. After deletion, power the radio on to confirm the MMSI is gone, then cancel your registration. Skipping this step creates real liability: if the new owner transmits a distress alert using your MMSI, the Coast Guard comes looking for you.13United States Coast Guard Navigation Center. What to Do When Selling or Disposing of Your Radio or Radio-equipped Vessel
EPIRBs Are Registered Separately
An MMSI and an Emergency Position Indicating Radio Beacon serve related but distinct roles. Your MMSI works through your DSC radio and AIS. An EPIRB transmits a separate 15-character hex ID via satellite when activated, and rescue coordination centers match that hex ID back to your MMSI and vessel information. EPIRB registration is handled by NOAA, not the FCC, and must be renewed every two years.14United States 406 MHz Beacon Registration. Frequently Asked Questions Getting an MMSI does not register your EPIRB, and registering your EPIRB does not get you an MMSI. Both need to be current.
Penalties for Operating Without Proper Registration
Operating a DSC radio or AIS without a properly assigned MMSI violates FCC rules. The FCC can impose forfeiture penalties for unlicensed operation, and radio equipment used in violations can be seized and forfeited to the government.
The consequences escalate sharply for false distress signals. Under federal law, knowingly and willfully communicating a false distress message to the Coast Guard is a class D felony. Beyond criminal prosecution, the offender faces a civil penalty of up to $10,000 and is liable for the full cost of any Coast Guard response.15Office of the Law Revision Counsel. 14 U.S. Code 521 – Saving Life and Property If you trigger a DSC distress call by mistake, immediately broadcast a cancellation on VHF Channel 16 to all stations.