SOLAS Instrumentation key terms

The International Convention for the Safety of Life at Sea, the treaty that sets minimum safety standards for construction, equipment, and operation of ships; flag States implement it through national law.

Amendment mechanism under SOLAS Article VIII whereby an amendment enters into force on a set date unless it is rejected by an agreed number of Parties before that date, avoiding slow ratification.

The State whose nationality a ship bears; it is responsible for surveying, certifying, and enforcing SOLAS compliance on that ship, including issuing statutory certificates.

Inspection by the authorities of a port State of foreign ships to verify compliance with SOLAS and other conventions, with detention or deficiency reports as possible outcomes.

A certificate issued to ships carrying dangerous goods or other special cargoes, confirming that the ship meets the additional construction and equipment requirements applicable to that trade.

A statutory certificate confirming that a cargo ship's life-saving, fire-fighting, and navigational equipment complies with the applicable SOLAS chapters and has been surveyed as required.

A statutory certificate issued after survey confirming that a ship's hull, machinery, and structural arrangements comply with the SOLAS construction requirements, including subdivision and watertight integrity.

A statutory certificate confirming that a ship's GMDSS radio installations meet the carriage, power supply, and performance requirements of SOLAS Chapter IV.

The structured inspection regime under SOLAS Chapter I by which a flag State or recognized organization verifies that a ship continues to meet the requirements before statutory certificates are issued or endorsed.

A classification society or other body authorized by a flag State to carry out surveys and issue certificates on its behalf, under a written agreement and oversight.

A sea area within continuous coverage of at least one VHF coast station with DSC alerting, in which a ship can rely on VHF for distress communication.

A sea area outside A1 and A2 but within coverage of an Inmarsat geostationary satellite providing continuous alerting, requiring ship earth station equipment in addition to VHF and MF/HF.

The Global Maritime Distress and Safety System, the SOLAS Chapter IV framework of radio equipment, power supplies, and operational procedures for distress alerting, search and rescue coordination, and maritime safety information.

A digital alerting technique used on VHF, MF, and HF for transmitting distress alerts and routine calls with a unique Maritime Mobile Service Identity, without voice communication.

Maritime Mobile Service Identity, the nine-digit number programmed into radio equipment that uniquely identifies a ship or coast station for DSC alerting and identification.

A narrow-band direct-printing system that broadcasts maritime safety information such as navigational warnings and weather forecasts to ships within a defined coastal area.

Navigational and meteorological warnings, forecasts, and urgent safety broadcasts that GMDSS equipment must be capable of receiving in all sea areas.

Satellite terminal carried on board that provides two-way communication for distress alerting and routine traffic in GMDSS sea areas A2 and A3.

A dedicated battery or emergency generator arrangement required by SOLAS Chapter IV to power GMDSS equipment for a specified period if the ship's main and emergency electrical supplies fail.

The periodic inspection and testing of GMDSS installations, including battery capacity checks and antenna inspection, required before a Safety Radio Certificate is issued or endorsed.

Electronic Chart Display and Information System, an approved navigation system that displays official vector chart data and can replace paper charts where carriage requirements are met.

Bridge Navigational Watch Alarm System, which monitors bridge activity and raises alarms on the bridge and in the master's and officers' cabins if the watchkeeper becomes incapacitated.

A recording device, similar to an aircraft black box, that continuously stores bridge audio and sensor data to support accident investigation.

The design of bridge layout, displays, alarms, and controls so that watchkeepers can perceive and act on information reliably, with consistent alarm priorities and minimal distraction.

The classification of alarms, typically emergency, alarm, warning, or caution, that determines their audible and visual presentation so that the most urgent condition is recognized first.

The systematic design and review of alarm systems to limit flooding of the operator with alarms and to ensure each alarm is meaningful, prioritized, and actionable.

An automatic arrangement that shuts down or slows machinery, or trips a boiler, when a monitored parameter exceeds a safe limit, protecting equipment and personnel.

A machinery space certified for periodic operation without a watchkeeper present, requiring alarms, safety systems, and remote indications to alert the duty engineer when attention is needed.

A timer-based alarm in periodically unattended machinery spaces that requires the duty engineer to reset it at intervals, alerting others if the engineer becomes incapacitated.

An independent generator or battery, located above the bulkhead deck, that supplies essential services such as emergency lighting, steering gear alarms, and radio equipment when the main supply fails.

A fixed system of detectors, call points, and control panel that automatically or manually signals a fire in protected spaces, with alarms on the bridge and at the continuously manned control station.

A permanently displayed plan showing the location of fire-fighting appliances, escape routes, and compartments, used by crew and shore firefighters during an emergency.

The pressurized piping system supplying fire hydrants and hoses throughout the ship, kept charged by fire pumps and isolated by valves so damage is contained.

A designated area where passengers and crew assemble before abandon-ship or during other emergencies, marked and communicated through the muster list and safety plan.

A survival craft and its launching appliance, required under SOLAS Chapter III to be maintained, inspected, and drilled so it can be launched safely in an emergency.

The periodic inspection and servicing of lifeboats, liferafts, launching appliances, and associated release gear to confirm they remain in working order and are correctly marked.

The condition of a ship's subdivision in which watertight doors, hatches, and closures are kept closed or properly controlled to prevent flooding from spreading between compartments.

A bridge or control-station display showing the open or closed position of remotely operated watertight doors, with alarms if a door is not properly secured.

The piping and pumps that collect and remove water from compartments, with alarms and level indications that alert the crew to unexpected accumulation.