The reliability of onboard communication systems is a fundamental pillar of maritime safety. Every GMDSS system must be ready to operate flawlessly, especially in critical situations where a distress call is the only link to rescue services. The Radio Survey is the mandatory inspection that ensures these systems function according to international standards and that the vessel can navigate safely and in full compliance with regulations.

What does a Radio Survey inspection consist of?

The Radio Survey is an official technical inspection that verifies the condition, operation and correct installation of all radioelectric equipment required by international maritime regulations.

It is implemented in accordance with the SOLAS Convention, Chapter IV (Radiocommunications) and the guidelines of the International Maritime Organization (IMO). Its purpose is to ensure that the ship is equipped to transmit and receive emergency alerts, as well as to maintain secure communications at all phases of navigation.

Regulatory framework and mandatory nature of the Radio Survey

Most ships subject to the SOLAS Convention must undergo an annual or periodic Radio Survey to maintain the validity of their certificates.

Without this up-to-date inspection, the vessel is exposed to:

• Arrests at port controls (PSC).

• Administrative sanctions.

• Loss of validity of the safety radio certificate.

• Problems with insurance policies that require proof of compliance with SOLAS.

The goal is not just to meet a requirement: it is to protect lives, the vessel and the continuity of the operation.

What is reviewed in a Radio Survey?

Unlike other inspections, the Radio Survey evaluates both the documentation and the actual functionality of the equipment. Typical points include:

1. Document verification

• • Licenses and certificates for radio equipment.

  • GMDSS Logbook Registration and Maintenance

  • Documents from the operator responsible for communications.

2. Physical inspection

• • Integrity of antennas, cabling, connectors and equipment.

  • Correct installation, fixing and accessibility of the systems.

3. Functional tests

• • VHF, MF/HF, DSC radios and communication with coastal stations.

  • Checking frequencies, power and transmission stability.

  • Testing of systems powered by main and emergency sources.

4. GMDSS Critical Systems

• • EPIRB: annual test, battery status and identity programming.

  • SART / AIS-SART: Operability verification.

  • NAVTEX: Reception of maritime notices.

  • AIS: operation, data integrity and position transmission.

  • Emergency batteries: capacity, charge, condition and expiration dates.

5. General system integration

The survey confirms that all GMDSS equipment operates as a coherent set and that the vessel can issue automatic distress alerts under any condition.

Operational consequences of not having a current Radio Survey

A failure in a GMDSS system can go unnoticed until it's most needed. The lack of a current survey can lead to:

• Interruptions in the operation due to unforeseen stops.

• Lack of real capacity to emit a distress signal.

• Inability to receive security or weather alerts.

• Increased risk to the crew and the vessel.

• Reputational impact for the shipowner or shipping company.

The Radio Survey is not a formality: it is a guarantee of operational safety.

Adaptation to regulatory updates

SOLAS requirements and GMDSS system specifications evolve periodically. Keeping the Radio Survey up to date ensures that the vessel incorporates mandatory updates and adapts to technical revisions that may affect NAVTEX, MF/HF, or satellite equipment.

Radio Survey Service with Dahlberg

At Dahlberg, we have decades of experience specializing in radio systems and GMDSS. Our technical team:

• We conduct Radio Surveys authorized by classification societies with which we are certified.

• It guarantees fast, accurate inspections adapted to the ship's operational schedule.

• It offers local support and technical assistance in the Balearic Islands.

• Ensures regulatory compliance and reliability of critical equipment on board.

Our goal is simple: to ensure that every vessel sails with maximum safety and the peace of mind that comes from meeting all international standards.

We are at your disposal to advise you and coordinate the inspection in the shortest possible time.