IEC 61097-3:2017

Overview - IEC 61097-3:2017 (GMDSS Part 3: DSC equipment)

IEC 61097-3:2017 defines the operational and performance requirements, testing methods and required test results for shipborne Digital Selective Calling (DSC) equipment used in the Global Maritime Distress and Safety System (GMDSS). The standard applies to DSC for MF, MF/HF and VHF installations and supports SOLAS Chapter IV carriage requirements. It integrates pertinent IMO resolutions, ITU Radio Regulations and ITU‑R Recommendations to ensure DSC devices meet international safety, interoperability and regulatory expectations.

Key elements:

• Standard reference: IEC 61097-3:2017 (Edition 2.0)
• Scope: DSC equipment for GMDSS, including operational procedures, technical characteristics and type‑approval test methods
• Linked with IEC 60945 for broader shipborne radio and navigational equipment requirements

Key Topics and Requirements

• Performance requirements & technical characteristics: Frequency behaviour, calling sensitivity, modulation and message format requirements for DSC calls.
• Operational requirements: User interface, categories of calls (distress, urgency, safety, routine), memory, audio/data interfaces and watch/scanning functions.
• Methods of testing and required results: Environmental tests, RF test methods for MF/MF‑HF/VHF transceivers and watch receivers, measurement uncertainty and pass/fail criteria.
• Automated procedures and interfaces: Standards for automated distress/non‑distress procedures, message composition, data interfaces and remote control of DSC functions.
• Bridge Alert Management (BAM): Compliance and alert classification/reporting integration with bridge systems.
• Software/firmware maintenance: Requirements and test methods for software integrity, updates and version control.
• Safety and protection: Antenna input protection, transmitter safeguards, compass safe distances and safety precautions.

Significant technical changes in this 2017 edition include updated DSC operation per IMO/ITU developments, BAM compliance, optional remote operation capability (supporting type‑approval testing) and consolidated RF test methods for convenient testing.

Applications - Who uses IEC 61097-3:2017

• Marine radio equipment manufacturers – design, verify and type‑approve GMDSS DSC transceivers and watch receivers.
• Test laboratories & certification bodies – perform conformity tests, environmental and RF measurements to IEC test methods and produce type‑approval reports.
• Shipbuilders & system integrators – integrate compliant DSC units into ship radio installations and bridge systems (BAM integration).
• Flag administrations, classification societies & maritime authorities – enforce SOLAS Chapter IV carriage requirements and certify equipment.
• Ship operators & safety officers – understand equipment capabilities for distress alerting, watchkeeping and automated procedures.

Related Standards (if applicable)

• IEC 60945 - Shipborne radio equipment and marine navigational equipment (general requirements)
• IMO Resolutions: A.803(19), A.804(19), A.806(19), A.694(17) - DSC facility and GMDSS guidance
• IMO MSC/Circ.862 - Distress button operation
• ITU Radio Regulations and ITU‑R Recommendations: M.493, M.541, M.689, M.821, M.1082

IEC 61097-3:2017 is essential for ensuring DSC equipment interoperability, SOLAS compliance and reliable maritime distress and safety communications. Keywords: IEC 61097-3:2017, GMDSS, DSC equipment, MF/HF, VHF, SOLAS, IMO, ITU, bridge alert management, type approval, RF test methods.