The moment you have a VHF radio on board, the Sportbootführerschein (SBF) alone is not enough. Operating a VHF radio station in German waters requires its own certificate, and this is exactly where many aspiring skippers get confused between two abbreviations: UBI and SRC. They sound similar but cover completely different areas of operation. This article explains what each certificate actually is, who needs which one, and how to prepare.

Why You Need a Radio Certificate at All

Being allowed to operate a VHF radio does not come automatically with buying the device. Anyone operating a ship radio station must demonstrate they understand the traffic circles, operating procedures, and above all the distress, urgency, and safety procedures. This is not a bureaucratic formality: in an emergency, correctly operating the radio and properly transmitting a distress call determines how fast help arrives. That is why holding a valid radio operator’s certificate is a legal requirement for operating a radio installation on board in Germany.

Which certificate you need depends on your area of operation: inland waters or the coast. Each has its own certificate, its own official question catalog, its own exam, and its own content. It’s worth knowing that both radio certificates are independent qualifications obtained separately from the Sportbootführerschein. If you have a radio on board, you need the matching radio certificate in addition to the SBF, not instead of it.

UBI: The VHF Certificate for Inland Waterways

The UKW-Sprechfunkzeugnis für den Binnenschifffahrtsfunk (UBI), roughly “VHF radio certificate for inland shipping radio,” is the officially recognized authorization to operate and supervise a ship radio station on inland waterways. It is administered by the examination boards of the German Sailing Association (Deutscher Segler-Verband, DSV).

Who Needs the UBI?

You need the UBI if you use a VHF radio installation on rivers, canals, or inland lakes. This applies in particular to:

  • Boaters on busy inland waterways such as the Rhine, Elbe, or Danube, where channel and sector radio communication is part of coordinating safely with other vessels and locks
  • Users of AIS (Automatic Identification System) devices with transmit capability
  • Charterers of houseboats and larger motorboats on inland waterways

Important: the UBI is independent of the SBF Binnen (the inland boating license). You can obtain the inland Sportbootführerschein without the UBI, and vice versa. In practice, though, it often makes sense to prepare for both together, since many inland boaters end up needing both certificates.

UBI Exam Structure

The theoretical UBI exam consists of 22 multiple-choice questions to be answered in 60 minutes. You pass with at least 17 correct answers. This is followed by a practical component with mandatory tasks such as setting up ATIS (Automatic Transmitter Identification System), general equipment knowledge, and correctly carrying out distress, urgency, and safety messages.

Content-wise, the UBI covers traffic circles as well as the order and types of radio traffic, frequencies and their use, the ATIS system, distress, urgency, and safety traffic, and the operation and technology of the radio installation. The official question catalog contains 130 questions.

The minimum age for the UBI exam is 15 years. No preparatory course is mandatory, you can study the theory independently. For the practical VHF part, some prior practice with the equipment is recommended.

UBI Costs

The official total fee for the UBI is made up of three components: admission to the exam, the theory and practice exam itself, and issuance of the certificate. According to the DSV, this adds up to roughly 109 euros in total. Retaking either the theory or practical part costs less separately. These official fees are independent of any study materials or apps used for preparation.

SRC: The Short Range Certificate for Coastal Radio

The Short Range Certificate (SRC), in German also referred to as a restricted radio operator’s certificate, is the official authorization to participate in the worldwide maritime radio service (GMDSS) in the VHF band. It authorizes you to operate VHF marine radio equipment including DSC (Digital Selective Calling) in the coastal area, known as sea area A1.

Who Needs the SRC?

The SRC is mandatory as soon as you use a VHF marine radio on board, whether permanently installed or handheld. This applies in particular to:

  • Sailors and motorboaters with a radio on board who operate on the North Sea, the Baltic Sea, or in coastal waters
  • Charter skippers, since many charter companies require the SRC for yachts equipped with a radio
  • Anyone who needs to be able to correctly transmit a DSC distress alert and a Mayday call in an emergency

The SRC is administered by the examination boards of the German Sailing Association (DSV) and the German Motor Yacht Association (Deutscher Motoryachtverband, DMYV). It is internationally recognized and valid indefinitely.

SRC Exam Structure

The theoretical SRC exam consists of a written multiple-choice questionnaire with 24 questions in 30 minutes, and you pass with 19 correct answers. This is followed by writing down a distress, urgency, or safety message, plus a practical component with four tasks on a DSC radio.

One notable difference from the UBI: the SRC exam includes an English-language component. You need to be able to receive and translate distress calls and translate German text into English, since international maritime radio communication is conducted in English.

Content-wise, the question catalog covers VHF marine radio and the GMDSS system for sea area A1, DSC procedures, distress, urgency, and safety traffic, ship-to-ship and ship-to-shore communication, the international phonetic alphabet, distress English, and the radio regulations of the ITU. The official question catalog contains 180 questions.

The minimum age for the SRC is also 15 years. No preparatory course is mandatory, though some radio schools offer one.

SRC Costs

The official exam fee for admission, examination, and issuance of the certificate through DSV/DMYV is roughly 128 euros. An optional preparatory course at a radio school typically costs an additional 250 to 350 euros, but as with the UBI, it is not a prerequisite for being admitted to the exam.

UBI vs. SRC at a Glance

The key difference between the two certificates is the area of operation: the UBI applies to inland waterways, the SRC to coastal waters (sea area A1). The two certificates are not mutually creditable, a UBI does not substitute for an SRC and vice versa.

The content also differs substantially. The UBI focuses on inland sector radio, route radio, and ATIS, while the SRC focuses on DSC procedures, GMDSS, and English-language distress communication. The SRC exam runs slightly tighter at 24 questions in 30 minutes compared to the UBI’s 22 questions in 60 minutes, but the SRC adds the extra English component.

There is good news for anyone who needs both certificates: if you already hold a maritime radio certificate such as the SRC or the more comprehensive LRC, the theoretical and practical UBI exams are shortened. The reverse is not true: getting the UBI first does not shorten the SRC exam, since the subject matter (DSC, GMDSS, English) is fundamentally different.

The Practical Component: What Actually Matters in the Exam

One point is often underestimated for both certificates: the theory is only half the exam. For both the UBI and the SRC, the practical component at the radio equipment plays a major role in whether you pass.

For the UBI, this includes correctly setting up the ATIS system, general equipment knowledge, and correctly carrying out distress, urgency, and safety messages according to the prescribed format. For the SRC, four tasks on a DSC radio are added, along with writing down an incoming distress, urgency, or safety message. If you rarely pick up a microphone in everyday life, don’t underestimate this part, and practice operating the equipment specifically before the exam. Examination boards pay close attention to the correct sequence of steps, for example when transmitting a distress call, since in a real emergency there is no time to hesitate.

Do You Need Both Certificates?

That depends on where you operate. If you only boat on rivers and inland lakes, the UBI is enough. If you only sail or motorboat along the coast, you only need the SRC. But if you want to operate a radio both on the Rhine and on the Baltic Sea, for example because you move your boat between inland waters and the coast, or because you want to charter in both, you need both certificates.

In that case, it makes sense to get the SRC first, since its content is more extensive, and then benefit from the shortened UBI exam afterward.

What About Offshore? The LRC

If you want to communicate beyond VHF range, for example on longer offshore passages, the SRC alone is not sufficient. That is where the Long Range Certificate (LRC) comes in, which additionally covers medium and short wave radio as well as satellite communication under GMDSS, and applies to sea areas A1 through A4. For most coastal areas of the North Sea and Baltic Sea, however, the SRC is entirely sufficient.

How to Prepare

Neither exam requires a mandatory course, and the official question catalogs are freely accessible and can be studied independently. Still, it helps to bring some structure to your preparation: work through the topic blocks one at a time, repeatedly practice the questions you tend to get wrong, and don’t neglect the practical component (operating the equipment, transmitting a distress call), since it is graded just as rigorously as the theory.

If you’re also preparing for the SBF Binnen or the SBF See, it’s worth bundling your radio and boating license preparation, since some topics such as distress signals and emergency conduct overlap. You can read more in our article on distress signals at sea.

Conclusion

UBI and SRC are two separate radio certificates for different areas of operation: inland shipping for the UBI, coastal radio for the SRC. Both are independent of the Sportbootführerschein, have their own question catalogs, and their own exam requirements. If you only operate in one of the two areas, you only need the matching certificate. If you want to cover both, you benefit from the shortened UBI exam by getting the SRC first.

The Boatpass app helps you prepare for both the UBI and the SRC with the complete official question catalogs, realistic exam simulation, and targeted error training, so you can walk into the exam confident and well prepared.