MMSI Number Registration: Cost, Requirements & How to Get One

21 July 2026 6 minutes Tags:

An MMSI number is a unique nine-digit identifier for your yacht's radio equipment. It is required by law for vessels with VHF, AIS, or EPIRB gear. This article explains what an MMSI number is, how to get one, the cost, and what you need to apply.

What Is an MMSI Number?

MMSI stands for Maritime Mobile Service Identity. It is a nine-digit number assigned to your vessel for radio communications. The first three digits are the Maritime Identification Digits (MID), which show the flag state that issued the number.

Your MMSI works like a phone number for your VHF radio, AIS, and EPIRB. It allows coast stations and other vessels to call you directly. It also enables Digital Selective Calling (DSC) for safety and distress alerts.

An MMSI number is not the same as an IMO number. IMO numbers are permanent identifiers for commercial ships over 100 GT. MMSI numbers are for radio licensing and apply to all vessels with radio equipment.

Do You Need an MMSI Number?

If your yacht has a VHF radio, AIS transceiver, or EPIRB, you likely need an MMSI number. Many countries require a valid radio license with an MMSI to operate radio equipment legally.

For yachts that only sail in inland or sheltered waters, an MMSI may not be mandatory. But if you cross borders or go offshore, most flag states and port authorities expect one.

An MMSI number is also needed for AIS to transmit your vessel's identity and position. Without it, your AIS will not work properly.

How to Get an MMSI Number for Your Yacht

You get an MMSI number from the radio licensing authority of your yacht's flag state. Some flags include the MMSI automatically with registration. Others require a separate application.

For example, San Marino and Gibraltar issue the MMSI as part of the registration package. Dutch and UK MMSI licenses can be applied for separately. Polish MMSI licenses are only available after the yacht registration is complete.

The application typically requires:
– Proof of vessel ownership
– Boat registration details
– A completed application form
– A passport or ID copy

BlueWater handles the entire application for you. We check your documents for free and submit them to the correct authority. You get your MMSI number, AIS number, and call sign.

Cost of an MMSI Number

The cost of an MMSI number depends on the flag state and whether it is bundled with registration. BlueWater offers an MMSI & AIS Radio License Service for €350. This includes the MMSI number, AIS number, and call sign.

For some flags, you can save by combining services. A Dutch MMSI license costs €250 standalone or €150 when combined with a Dutch Zeebrief. A UK MMSI license costs €250 standalone or €150 with UK Part 1 registration.

Some flags charge an annual radio license tax of around €34 to €37.50. Others have no recurring fees. BlueWater's prices are all-inclusive, so you know the total upfront.

How Long Does It Take?

Processing times vary by flag state. Dutch MMSI licenses are typically processed within 24 hours. UK licenses usually take one working day. San Marino licenses are issued within a few working days.

Polish MMSI licenses take longer — up to eight weeks after yacht registration is completed. This is because Poland requires the radio license to be applied for separately.

BlueWater's MMSI & AIS Radio License Service is often completed in 24 hours or less from the moment we receive your information.

Does an MMSI Number Stay With the Boat?

No, an MMSI number is tied to the flag state, not the vessel. If you sell your yacht, the new owner must apply for a new MMSI under their own name and flag. You cannot transfer an MMSI to a different owner.

If you change your yacht's flag, you usually need a new MMSI from the new flag state. Some flags allow you to keep the same number if you re-register, but this is not common.

Always check with the issuing authority before assuming the number can stay.

Can You Track a Boat With an MMSI Number?

Yes, an MMSI number allows AIS to broadcast your yacht's position. Other vessels and shore stations can see your location, speed, and course. This is used for collision avoidance and vessel traffic services.

However, an MMSI alone does not give you satellite tracking. For that, you need a separate AIS transceiver with satellite uplink or a dedicated tracker.

Public AIS websites show vessels with active AIS. You can look up a yacht by its MMSI number on sites like MarineTraffic or VesselFinder.

Summary

An MMSI number is a required radio identifier for most yachts with VHF, AIS, or EPIRB. It is not free, but costs vary by flag. BlueWater can arrange your MMSI quickly — often within 24 hours. Contact us for a free consultation and a clear all-inclusive price.

Frequently asked questions

What is an MMSI number?

An MMSI number is a nine-digit Maritime Mobile Service Identity used to identify your yacht for radio communications. It works like a phone number for your VHF, AIS, and EPIRB.

Do I need an MMSI number for my yacht?

Yes, if your yacht has a VHF radio, AIS, or EPIRB, you generally need an MMSI number. It is required by law in most countries for vessels with radio equipment.

How do I get an MMSI number?

You apply through your yacht's flag state radio licensing authority. BlueWater handles the process for you — we submit the application and provide the MMSI, AIS number, and call sign.

What is the cost of obtaining an MMSI number?

BlueWater's MMSI & AIS Radio License Service costs €350. For some flags, combining with registration gives a discount — for example, a Dutch MMSI is €250 standalone or €150 with a Zeebrief.

How long does it take to get an MMSI number?

It depends on the flag. Dutch and UK MMSI licenses are often processed within 24 hours. San Marino takes a few working days. Polish MMSI can take up to eight weeks.

Official sources

Trusted Experience in International Yacht Registration

For more than 18 years, BlueWater Registration Services has helped private and commercial yacht owners navigate international registration and documentation requirements. Our experienced specialists provide personal support, practical guidance and clear communication throughout the registration process.

We assist clients worldwide and are available seven days a week. Whether you are registering a yacht, changing flag or purchasing a vessel abroad, our team can help you identify the most suitable registration options for your circumstances.

Speak directly with a yacht registration specialist.

Facts checked and up to date as of 22 July 2026.