How to Get a Boat MMSI Number

30 July 2026 4 minutes Tags:

An MMSI number is a unique nine-digit identifier for your boat's radio equipment. It is required by law if you have a VHF radio, AIS, or EPIRB on board. This guide explains how to get an MMSI number for your boat, what it costs, and what documents you need.

What Is an MMSI Number and Why Do You Need One?

MMSI stands for Maritime Mobile Service Identity. It is a nine-digit number that works like a phone number for your boat. It allows other vessels and coast stations to call you directly using Digital Selective Calling (DSC) on VHF radio. It also enables your AIS to broadcast your position and identity.

Without an MMSI number, your DSC radio can only be used for listening. You cannot send a distress alert or make a routine DSC call. Many countries require an MMSI and a ship station license for any vessel with VHF, AIS, or EPIRB equipment.

Who Issues an MMSI Number?

Each flag state has its own authority that issues MMSI numbers. For example, the Netherlands issues them through the RDI (Rijksinspectie Digitale Infrastructuur). The UK issues them through Ofcom. San Marino issues them as part of the registration package.

Some flags, like Gibraltar and San Marino, include the MMSI license automatically with the boat registration. Others, like the Netherlands, Poland, and the UK, offer it as a separate application. BlueWater can arrange MMSI registration for many flags, including Dutch, Polish, UK, and San Marino.

Documents Needed for MMSI Number Registration

To apply for an MMSI number, you typically need:

Proof of vessel ownership (bill of sale or builder's certificate)
Your boat registration details (flag state and official number)
A completed application form
A copy of your passport or ID

Some flags may also require proof of insurance or a survey certificate. BlueWater offers a free document pre-check before submission to ensure everything is correct.

How Much Does an MMSI Number Cost?

The cost of an MMSI number varies by flag state. BlueWater offers a Dutch MMSI Radio License for €350 as a standalone service. The package includes the MMSI number, AIS number, and call sign.

Some flags charge an annual radio license tax. BlueWater's prices are all-inclusive with no hidden fees.

How Long Does It Take to Get an MMSI Number?

Processing times depend on the flag state. A Dutch MMSI license can take several weeks to process. A UK license usually takes one working day. San Marino licenses are issued within a few working days. Polish licenses can take up to eight weeks after the yacht registration is completed.

BlueWater handles the entire application process, so you do not have to deal with the authorities directly.

Is the MMSI Number Free?

No, an MMSI number is not free. You must pay a fee to the issuing authority or a service provider like BlueWater. The cost covers the administrative work and the license itself. Some flags include the MMSI license in the registration package, so you pay for it as part of your initial registration fee.

Can I Use the Same MMSI Number on a Different Boat?

No, an MMSI number is tied to the flag state, not the vessel. If you sell your boat, the MMSI does not stay with the boat. If you buy a new boat, you need a new MMSI number for that vessel. Also, if you change your boat's flag, you usually need a new MMSI from the new flag state.

Frequently asked questions

How do I get a boat MMSI number?

You apply through the radio licensing authority of your boat's flag state. BlueWater can handle the application for you. You need proof of ownership, boat registration details, and a completed form.

Is the MMSI number free?

No, an MMSI number is not free. BlueWater's Dutch MMSI license costs €350 standalone.

What is a marine radio licence?

A marine radio licence is a legal document that authorizes you to operate radio equipment on your boat. It includes the MMSI number and call sign. You must keep the licence on board at all times.

Can I get an MMSI number without boat registration?

In most cases, you need a boat registration first. Some flags, like the Netherlands, issue MMSI numbers only to vessels registered under their flag. BlueWater can help you with both registration and MMSI.

How long is an MMSI number valid?

The validity of an MMSI number and the associated radio license depends on the flag state. Some flags require periodic renewal with a fee. BlueWater handles renewals for clients.

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 9 August 2026.