SOLAS Chapter X: Safety Measures for High-Speed Craft

Background

Why a separate chapter for high-speed craft

Chapter X recognises that high-speed craft operate in a fundamentally different envelope from conventional ships. The unique characteristics that drive a separate regulatory regime include:

• High operating speed (typically 30 to 50 knots in service, with some craft above 60 knots): the kinetic energy and impact loads in collision or grounding are an order of magnitude higher than for conventional ships at similar displacement.
• Lightweight construction in aluminium, fibre-reinforced composite, or thin-plate steel: enables high speed but requires fire-protection approaches different from steel-construction conventional ships.
• Limited cargo and reserve buoyancy relative to displacement: the structural margin is tighter, and damage tolerance is lower.
• Short-duration voyages typically of 2 to 4 hours: passenger orientation and crew familiarisation are different from long-voyage cruise ships.
• Coastal or short-sea routes: HSC rarely sail in deep ocean, allowing operational reliance on shore-based services (weather updates, traffic awareness, rescue resources).
• Acceleration environment: high cyclic acceleration on passengers and structure requires specific design considerations for seating, restraint, and passenger orientation.

A regulatory regime designed for conventional steel ocean-going ships would either over-design HSC (making them uneconomic) or under-protect them (making them unsafe). The HSC Code approach is to set the regulatory envelope for HSC at the same target safety level as conventional ships, but achieved through different means: tighter operating restrictions, more rigorous type approval, and tighter coordination with shore.

The HSC definition

A high-speed craft is defined by speed:

$$V > 3.7 \\cdot \\nabla^{1/6}$$

where V is the maximum speed in metres per second and ∇ is the volumetric displacement in cubic metres at design loaded condition. The formula gives a speed-to-size ratio above which conventional ship design is no longer suitable. For a 500-tonne craft, the threshold is approximately 18 m/s (35 knots); for a 5000-tonne craft, approximately 26 m/s (50 knots).

The definition captures:

• Catamarans and trimarans of fast-ferry type, typically 30 to 90 metres LOA, carrying 200 to 1500 passengers at 35 to 45 knots.
• Hydrofoils including the Boeing Jetfoil and similar, lifting on submerged foils at 40 to 50 knots.
• Surface-effect ships (SES): pressurised air-cushion vessels with rigid sidewalls, operating at 30 to 50 knots.
• Hovercraft (ACV - Air Cushion Vehicles): fully air-cushion-borne, operating over water and over land surfaces.

Major amendment history

• 1994 (HSC 1994 Code, Resolution MSC.36(63)): original HSC Code. Applied to high-speed craft built between 1996 and 2002.
• 2000 (HSC 2000 Code, Resolution MSC.97(73)): substantial revision. Applies to high-speed craft built on or after 1 July 2002. Tightened operational restrictions, added detailed crew training and quality management requirements.
• Subsequent amendments: cycles in 2002, 2004, 2006, 2010 and 2014 progressively addressed specific issues: lightweight passenger seats, evacuation in heeled conditions, bridge ergonomics, fire integrity of composite materials, integration with the IGF Code for HSC using LNG fuel.
• Polar Code interaction (2017): HSC operating in polar waters are subject to the Polar Code in addition to the HSC Code.

Relationship to conventional SOLAS

A high-speed craft holding a HSC Safety Certificate is exempted from compliance with most provisions of the conventional SOLAS chapters that would otherwise apply (Chapters II-1, II-2, III, V, VI, VII as applicable). The HSC Code provisions are functionally equivalent but adapted to HSC characteristics. Specific cross-references include:

• HSC Code Chapter 4 ≈ SOLAS Chapter II-1 (stability and subdivision).
• HSC Code Chapter 7 ≈ SOLAS Chapter II-2 (fire safety).
• HSC Code Chapter 8 ≈ SOLAS Chapter III (life-saving appliances).
• HSC Code Chapter 13 ≈ SOLAS Chapter V (navigational equipment).

The functional equivalence allows a high-speed craft to be SOLAS-compliant via the HSC Code rather than via the conventional chapters.

Application

Application of the chapter

Chapter X applies to:

• Passenger high-speed craft carrying more than 12 passengers built on or after 1 January 1996 (HSC 1994 Code) or 1 July 2002 (HSC 2000 Code).
• Cargo high-speed craft of 500 GT and above built on or after 1 January 1996 or 1 July 2002.
• HSC of any size on international voyages where the route includes an SOLAS-applicable territorial sea segment, with limited adaptations.

The applicable HSC Code (1994 or 2000) depends on the keel-laying date.

The Reg X/3 calculator returns the applicable code for a given craft.

Categories of HSC

The HSC Code distinguishes:

• Category A passenger craft: routes such that the craft is at all times within 4 hours of a port of refuge at the design speed in fully loaded condition. The 4-hour refuge limit is the operating constraint that allows reduced LSA capacity (the rationale being that rescue can reach the craft within 4 hours if needed). Most short-route fast ferries fall in Category A.
• Category B passenger craft: routes with refuge within 8 hours, with reduced operational restrictions. Fewer ferries operate in Category B because the longer refuge time triggers higher LSA requirements.
• Category B cargo craft: cargo-only fast craft, typically with smaller crew and simpler accommodation. The 8-hour refuge limit applies but with cargo-specific provisions.

Category A is the most operationally constrained and the most regulatorily lightweight; Category B is the inverse. Most commercial HSC are Category A passenger craft.

Definitions and operational requirements

Permit to Operate

Every HSC carries a Permit to Operate issued by the flag state, listing:

• The route or routes on which the craft may operate.
• The maximum significant wave height for operation.
• The maximum wind speed for operation.
• Any other operational restrictions (visibility, traffic conditions, hours of darkness).
• The maximum number of persons that may be carried.

The Permit to Operate is checked at HSC route inspection and is the operational equivalent of a more conventional safety certificate combined with an operational manual.

Quality management system

The HSC Code requires the operator to maintain a Quality Management System (QMS) covering:

• HSC operational procedures.
• Crew training and certification records.
• Maintenance and inspection records.
• Customer (passenger) feedback and incident reporting.
• Continuous improvement.

The QMS is audited annually by the flag state or by a recognised organisation. The HSC Code QMS is more rigorous than the conventional ISM Code Safety Management System, reflecting the higher operational discipline required for high-speed operations.

Crew training

HSC crew require certification under STCW Section A-V/2 (Training for masters, officers and ratings serving on passenger ships, with HSC-specific provisions) and additional type-rating training:

• Type rating: training specific to the HSC type (catamaran, hydrofoil, hovercraft) and to the specific craft model. Type rating is renewed at intervals.
• Bridge resource management: high-frequency communication and decision-making at high speed.
• Emergency response: rapid evacuation procedures, fire response, casualty handling.
• Familiarisation cruise: each crew member must complete a defined number of hours on the specific HSC before operating it independently.

Stability and structure

Damage stability

HSC damage stability requirements are similar to conventional ships but apply at higher operational speeds. Specific requirements include:

• Survival of single-compartment damage at full operational loading.
• Two-compartment damage for Category A passenger HSC where the route includes specific risk zones.
• Stability after damage at the maximum operational sea state.

Structural strength

HSC structures are typically of:

• Marine-grade aluminium (5083, 6061, etc.) for catamaran and trimaran hulls.
• Fibre-reinforced composite (glass or carbon fibre with epoxy or vinylester resin) for hull plating, decks, superstructure, and high-aspect-ratio components.
• Thin-plate steel for some hovercraft and hydrofoil applications.

Each material requires specific design criteria:

• Aluminium: fatigue analysis under spectrum loading, with attention to weld details and to corrosion margins.
• Composite: ply-by-ply layup design, fatigue test approval, fire integrity certification (composites are inherently flammable and require specific HSC Code Chapter 7 fire test pathways).
• Thin steel: weld quality, plate distortion, structural connection details.

The IACS HSC structural unified requirements provide engineering guidance.

Acceleration environment

HSC operate at high cyclic accelerations:

• Vertical acceleration (heave) at peaks of 1 to 2 g in moderate seas.
• Horizontal acceleration (sway) during high-speed turns at peaks of 0.5 g.
• Slam loading when the hull contacts the water surface after a high motion: peak loads of 5 to 10 times static design load.

The HSC Code Chapter 4 specifies the design accelerations and the consequent structural verification.

Fire safety

Lightweight materials and fire integrity

HSC fire safety must address the inherent flammability of construction materials:

• Aluminium: melts at approximately 660 degrees Celsius, well below the 900-degree Celsius reached in standard ship fire scenarios. Aluminium structure must be insulated to prevent collapse during the evacuation period.
• Composite: combustible matrix (resin) decomposes in fire, releasing toxic smoke. Composite structure requires specific FRP-fire approval pathways.
• Thin steel: lower thermal mass than conventional ship steel, faster temperature rise in fire.

The HSC Code Chapter 7 provides:

• Fire integrity ratings for HSC structures (HSC 60, HSC 30, HSC 15, HSC 0) analogous to but distinct from SOLAS A-class divisions.
• Material approval testing under specific HSC Code procedures.
• Compartmentation and means of escape adapted to short-route operation.

Detection and extinguishing

HSC fire detection covers:

• Engine room with smoke and flame detection.
• Passenger spaces with smoke and heat detection.
• Galley with heat detection and exhaust hood suppression.
• Battery room (if fitted) with appropriate detection.

Fixed extinguishing systems are typically:

• Water mist for passenger spaces (the lighter weight and lower water consumption are advantageous for HSC).
• CO2 or inert gas for engine room.
• Foam for cargo deck (cargo HSC).

Life-saving appliances

LSA architecture for HSC

HSC LSA differs from conventional Chapter III requirements:

• Reduced LSA capacity for Category A craft (within 4-hour refuge): 100 percent of persons in liferafts, with no requirement for lifeboats. The rationale is that rescue can reach the craft well within survival time in liferafts.
• Marine evacuation systems (MES) as primary evacuation mode: the inflatable chute and platform allow rapid evacuation of large passenger groups directly from embarkation deck to deployed liferaft.
• Lifejackets and immersion suits for all persons.
• Personal LSA equipment at each seating row in passenger compartments.

The MES is particularly important on HSC because the high passenger density (up to 1000 passengers on the larger fast ferries) cannot be evacuated by lifeboats alone in the operationally relevant time. MES inflation completes within 90 seconds for the basic system.

Passenger evacuation drills

HSC operators conduct frequent passenger evacuation drills:

• Pre-departure briefing to passengers covering muster, lifejacket donning, MES use.
• Crew evacuation drills at intervals.
• MES live deployment at intervals (typically annual).
• Full passenger evacuation during fleet-wide tests at the operator’s discretion.

The drills are documented and verified at HSC route inspections.

HSC types in detail

Catamarans

The catamaran is the dominant HSC type in commercial fast ferry service. Key engineering features:

• Twin hulls connected by a wet deck (the area between the hulls below the main deck) and an upper structure carrying the passenger space.
• Hull form: typically slender, with high length-to-beam ratio per hull (8 to 12) supporting low wave-making resistance at high speed.
• Material: marine-grade aluminium (5083 typically for plate, 6061 for extrusions) with high-strength welded construction. Some smaller catamarans use FRP composite construction.
• Propulsion: water-jets are dominant for catamarans above 30 knots (avoiding cavitation and providing precise low-speed control). Conventional propellers are used for slower craft.
• Passenger capacity: typical fast ferry catamarans carry 200 to 1500 passengers in air-conditioned passenger compartments arranged on one or two decks.
• Operating speed: 30 to 45 knots in service, with some craft above 50 knots in optimal conditions.
• Sea state limitation: typically restricted to significant wave heights below 2 to 3 metres for passenger comfort and structural fatigue.

Major catamaran builders include Incat (Australia), Austal (Australia), Damen (Netherlands), and Buquebús (Argentina). The Incat 112-metre catamaran, capable of carrying over 1000 passengers and approximately 200 vehicles, has been a successful design across multiple operators.

Trimarans

Trimarans use a central main hull and two outrigger amas, providing:

• Stability: the wide hull stance gives high transverse metacentric height and stability margin.
• Speed potential: at the same displacement, trimarans typically have lower wave-making resistance than catamarans, enabling higher speeds.
• Passenger space: the central hull provides a large continuous passenger compartment.
• Construction complexity: more complex than catamaran, with the connecting structure requiring careful fatigue analysis.

Trimarans have been adopted on a smaller scale than catamarans in the commercial fast ferry market. The Stena HSS trimaran was an early notable example.

Hydrofoils

Hydrofoils lift the hull clear of the water on submerged foils at speeds above 25 knots, dramatically reducing drag. Types include:

• Surface-piercing hydrofoils: foils that emerge from the water surface, providing self-stabilising lift via the water-line position.
• Fully submerged hydrofoils: foils entirely below the water, requiring active depth control via foil flaps or angle adjustment. Boeing Jetfoils use fully submerged hydrofoils.

Hydrofoils have largely been displaced by catamarans in new-build fast ferry service due to higher capital cost and more demanding maintenance requirements. They remain in service in specific routes (Hong Kong-Macau, certain Japanese services, a few Mediterranean operations).

Surface-effect ships (SES)

SES are partial air-cushion vessels with rigid sidewalls. The cushion is generated by lift fans and contained by the sidewalls and by flexible seals at the bow and stern. SES achieve speeds of 30 to 50 knots with good seakeeping in moderate sea states. Notable applications include naval craft (the Norwegian Skjold-class corvettes use SES technology) and a smaller commercial fast ferry segment.

Hovercraft (ACV)

Air Cushion Vehicles are fully cushion-borne, with the cushion contained by a flexible skirt. They can operate over water and over flat land surfaces. Commercial hovercraft fast ferry service was significant in the 1970s to 1990s on the English Channel (the Hoverlloyd and Hovertravel services) but largely ended with competition from the Channel Tunnel and improved catamaran technology. Hovercraft remain in service in specific niches (river crossings in Russia and Central Asia, Solent ferry service in UK).

HSC Code chapter walkthrough

The HSC Code is structured into 18 Chapters and a series of annexes:

• Chapter 1: General provisions including definitions and scope of application.
• Chapter 2: Buoyancy, stability and subdivision (analogous to SOLAS Chapter II-1 Part B).
• Chapter 3: Structures (material specifications, design loads, structural details for HSC types).
• Chapter 4: Accommodation and escape measures (passenger seating, escape route geometry, emergency lighting).
• Chapter 5: Directional control system (steering and manoeuvring).
• Chapter 6: Anchoring, towing and berthing arrangements.
• Chapter 7: Fire safety (HSC-specific fire test pathways and fire protection).
• Chapter 8: Life-saving appliances and arrangements (HSC-specific LSA).
• Chapter 9: Machinery (main propulsion machinery, auxiliary machinery, fuel arrangements).
• Chapter 10: Auxiliary systems.
• Chapter 11: Remote control, alarm and safety systems.
• Chapter 12: Electrical installations.
• Chapter 13: Navigation equipment.
• Chapter 14: Radiocommunications.
• Chapter 15: Operational requirements.
• Chapter 16: Stability information and operational manual.
• Chapter 17: Type rating and crew training.
• Chapter 18: Maintenance, inspection and survey.

Each chapter contains the prescriptive provisions equivalent to (but adapted from) the corresponding SOLAS chapter. The HSC Code uses a different organisation (chapter-by-system rather than chapter-by-application) reflecting the integrated nature of HSC design.

Operational restrictions

Distance from refuge

The Category A 4-hour refuge limit and Category B 8-hour refuge limit are operational constraints calculated as follows:

• The craft’s design service speed in fully loaded condition (typically 30 to 45 knots).
• The route geometry from any point on the route to the nearest port of refuge.
• The maximum permissible time-to-refuge is calculated and must not exceed the category limit.

For each route, the operator submits the route plan to the flag state for approval. The flag state verifies the time-to-refuge calculation and lists the route on the Permit to Operate.

Weather restrictions

Each HSC has a maximum operating significant wave height and maximum operating wind speed listed on the Permit to Operate, derived from:

• Stability and structural fatigue analysis at the design loading.
• Passenger comfort and motion sickness limits.
• Bridge handling demands at high speed in adverse weather.

When the forecast or actual weather exceeds the operating limits, the operator must:

• Cancel the voyage.
• Substitute a conventional ship if available.
• Refuse passenger boarding.

Visibility restrictions

HSC operating in restricted visibility (fog, heavy rain, snow) face additional restrictions. The high speed combined with limited visibility creates collision risk that the bridge resource management cannot fully mitigate. Some HSC routes require radar-only operation in poor visibility, with reduced speed or cancellation if traffic density is high.

Hours of darkness

Some HSC routes are restricted to daylight operation due to:

• Limited night-time visibility for object identification (floating debris, small craft, navigation marks).
• Crew fatigue at high-speed operations.
• Reduced shore-side rescue resource availability at night.

The night operation restriction is increasingly relaxed for modern HSC with FLIR (Forward-Looking Infrared) and improved radar, but specific routes retain it.

Bridge ergonomics

HSC bridge design must support:

• High-frequency information: continuous monitoring of speed, position, course, traffic, weather, machinery status at scan rates of 5 to 10 seconds.
• Compact wheelhouse: HSC wheelhouses are typically smaller than equivalent conventional ship bridges, requiring careful workstation layout.
• Joystick control: manoeuvring control via joystick is standard, replacing the conventional helm.
• Electronic chart: integrated with radar and AIS for high-speed traffic awareness.
• Communications: VHF, satellite, and operator-specific radio for shore coordination.
• Single-person operation in normal conditions, with multi-person watch in restricted manoeuvring.

The HSC Code Chapter 13 provides detailed bridge layout requirements.

Electric and hybrid HSC

Electric and hybrid HSC are emerging as alternatives to diesel propulsion:

• All-electric short-haul ferries: a small but growing fleet of catamarans using lithium-ion battery packs for short routes (typically under 20 nautical miles, with shore-side charging). Norway has been the leader, with multiple electric fjord ferries in service since 2015.
• Diesel-electric: combining diesel generators with electric motor propulsion, providing flexibility for power management and reduced fuel consumption at part-load.
• Battery-hybrid: combining battery storage with diesel for peak-shaving and zero-emission operation in port.
• Hydrogen fuel cells: under development, with prototype HSC entering service from 2024 onward.

The IGF Code under SOLAS Chapter II-1 Part G applies to HSC using low-flashpoint fuels and integrates with the HSC Code through Chapter X cross-reference.

Stability calculation methodology for HSC

Intact stability

Intact stability requirements for HSC are similar to conventional ships in principle but adapted to the high-speed operation:

• Static GM at maximum loaded condition with calibration to the loading conditions documented in the stability information manual.
• Dynamic stability under the design wind heeling moment, with criteria for area under the GZ curve up to defined heel angles.
• Roll motion at high speed specifically considered: HSC roll periods are typically short (3 to 5 seconds) compared with conventional ships (10 to 20 seconds), creating different motion-induced cargo and passenger loads.
• Yaw stability under fast helm input: the steering response curves must be stable, without overshoot or sustained oscillation.

Damage stability

Damage stability for HSC follows the probabilistic methodology of the HSC Code Chapter 2, with criteria adapted for HSC:

• Single-compartment damage: HSC must survive flooding of any one compartment with positive righting arm and acceptable equilibrium heel.
• Two-compartment damage: required for Category A passenger HSC where the route’s risk profile justifies it.
• Damage extent: less severe than conventional ships in absolute terms but proportionally similar relative to HSC dimensions.

Speed-related stability

HSC stability at high speed differs from conventional ships:

• Hydrodynamic forces: at speeds above 30 knots, hydrodynamic forces from the water flow around the hull contribute substantially to stability. Hydrofoil HSC stability depends almost entirely on hydrodynamic forces (the hull is clear of the water).
• Cushion-related stability (SES, hovercraft): cushion pressure changes the apparent stability behaviour.
• High-speed turn stability: HSC heel inboard during high-speed turns due to centripetal forces; the inboard heel can exceed the heel from wind in some conditions.

The HSC Code Chapter 2 provides specific criteria for these conditions.

Maintenance and inspection regime

Survey schedule

HSC have a more frequent survey schedule than conventional ships:

• Annual survey: visual inspection of structure, machinery, life-saving appliances, navigation equipment, electrical systems.
• Periodical survey (every 30 months): more detailed examination including structural close-up.
• Renewal survey (every 5 years): comprehensive examination similar to a conventional ship’s special survey.
• Hull damage survey: after grounding, contact damage, or collision.
• Lightweight survey: at intervals (typically 5 years) to detect lightweight changes from accumulated marine growth, modifications, equipment additions.

The shorter survey intervals reflect the higher cyclic loading and operational discipline of HSC operations.

Maintenance scope

HSC maintenance includes:

• Hull and structure: inspection of plating, stiffeners, welds, with attention to fatigue-prone details (hull-to-deck connection, water-jet inlet, foil mounting on hydrofoils).
• Propulsion machinery: water-jet maintenance, propeller inspection, gearbox health monitoring, lube oil analysis.
• Cushion system (SES, hovercraft): seal replacement, lift fan maintenance, cushion pressure calibration.
• Foil maintenance (hydrofoil): foil inspection for damage from floating debris, control system calibration.
• Electrical and electronic: bridge equipment calibration, software updates.

The maintenance is documented in the HSC’s quality management system and is verified at the periodical survey.

HSC routes and operators

Major fast ferry markets

The principal HSC fast ferry markets globally include:

• Hong Kong / Macau / Pearl River Delta: the world’s largest HSC concentration, with multiple operators running catamarans and hydrofoils on routes between Hong Kong, Macau, Shenzhen, Guangzhou, Zhuhai. Service density approaches 100 sailings per day.
• Greek Aegean: extensive HSC service among the Greek islands, with operators including Hellenic Seaways, Sea Jets and others. Multiple catamaran types in service.
• Mediterranean: HSC routes in the Adriatic, the Tyrrhenian Sea, and the western Mediterranean, with operators including Liberty Lines, SNAV, Acciona Trasmediterránea.
• Baltic and North Sea: HSC routes between Stockholm, Gothenburg, Helsinki, Tallinn and Riga; some HSC service in the Norwegian fjords.
• English Channel: limited HSC service after the Channel Tunnel competition reduced demand; some seasonal HSC services remain.
• Australia: domestic HSC service in Tasmania (Spirit of Tasmania), Sydney Harbour, Brisbane Bay.
• Japan: extensive HSC service in the Seto Inland Sea and to the southern islands.
• Caribbean: HSC routes between island groups, often integrated with conventional ferry service.
• Norway: extensive HSC service in the fjords, increasingly using electric and hybrid HSC.
• South Korea: domestic HSC service.

HSC operator profiles

The major HSC operators include:

• Stena Line: Sweden-based, operating HSS class fast ferries on Irish Sea routes.
• DFDS: Denmark-based, with HSC service on selected North Sea routes.
• TurboJET: Hong Kong-based, with extensive Pearl River Delta service.
• Liberty Lines: Italy-based, with Mediterranean HSC service.
• Cotemar: Mexico-based, with Gulf of Mexico HSC service.
• InterIsland: New Zealand-based, with Cook Strait service.
• Norled: Norway-based, with extensive fjord service including electric HSC.
• Hovertravel: UK-based, operating hovercraft on the Solent.

HSC fleet age and modernisation

The world HSC fleet has aged since the peak deliveries of the late 1990s and early 2000s. Modernisation drivers include:

• Energy efficiency: newer HSC are 20 to 30 percent more fuel-efficient than 1990s models.
• Emissions: post-2020 IMO sulphur cap and post-2025 FuelEU Maritime have driven HSC toward distillate fuels and toward LNG/methanol/electric alternatives.
• Passenger comfort: improved seating, motion stabilisation, air conditioning.
• Safety: HSC 2000 Code provisions are progressively retrofitted on existing craft.

Comparison with conventional ferry service

HSC fast ferry service competes with:

• Conventional ferries: slower (typically 15 to 22 knots) but with higher passenger and vehicle capacity, more comfortable in heavy weather, lower fuel consumption.
• Aircraft: faster but more expensive, with constraint on cargo, and with environmental impact considerations.
• Bridge / tunnel infrastructure: where available, fixed infrastructure displaces both ferry and HSC services.

Each HSC route has been driven by a specific commercial logic (high passenger volume, time-sensitive demand, no fixed infrastructure available) that justifies the higher capital and operating cost relative to conventional ferries.

HSC Code Chapter 7: Fire safety in detail

HSC fire integrity ratings

The HSC Code defines a separate set of fire integrity divisions distinct from but functionally analogous to SOLAS A, B, C divisions:

• HSC 60: division providing 60 minutes of structural and thermal integrity in the standard fire test.
• HSC 30: 30 minutes integrity.
• HSC 15: 15 minutes integrity.
• HSC 0: structural integrity without insulation rating.

The HSC integrity ratings are achieved through a combination of:

• Aluminium structure with insulating panels (typically mineral wool or rock wool) protecting the aluminium against the standard fire-test temperature.
• Composite structure with intumescent coatings or with intrinsically fire-rated composites (some marine FRP formulations are designed for HSC 30 fire test).
• Steel structure with appropriate insulation, similar to conventional ship A-class divisions.

FTP Code adapted for HSC

The Fire Test Procedures Code (FTP Code) used for conventional ship materials is adapted for HSC through specific test procedures in the HSC Code Chapter 7. Key adaptations include:

• Surface flammability: HSC accommodation surfaces use the same FTP test as conventional ships but with stricter limits given the higher acceleration and shorter evacuation time.
• Smoke generation: smoke density limits are stricter, recognising the smaller cabin volumes and shorter evacuation routes.
• Toxicity: gas concentration limits are stricter, especially for HBr, HCl and HCN (relevant to halogenated FRP composites).
• Furniture ignitability: HSC seating, table tops and cabin furniture must meet specific ignition resistance tests.

Fire detection on HSC

HSC fire detection includes:

• Optical smoke detectors in passenger spaces and accommodation.
• Heat detectors in galley and other heat-prone spaces.
• Flame detectors in machinery spaces with high fuel inventory.
• Continuous bridge monitoring of all detection zones.

Detection sensitivity is set higher than on conventional ships to compensate for the shorter time available for response.

HSC fire-fighting

Fire-fighting on HSC must be rapid given the limited evacuation time:

• Fixed water mist in passenger spaces and machinery spaces (preferred over CO2 because passenger spaces may be occupied during fire response).
• CO2 in cargo spaces (cargo HSC) and in unoccupied machinery spaces.
• Portable extinguishers distributed throughout passenger and crew areas.
• Firefighter outfits for at least 2 crew members, with SCBA.
• Fire pumps with capacity sufficient for the HSC structure and the route’s environmental conditions.

Galley and engine room fire risk

Specific fire risks on HSC include:

• Galley (where fitted): cooking equipment with automatic shut-off and fat-fryer suppression.
• Engine room: fuel oil arrangements with leak-detection, hot-surface insulation, automatic engine shutdown on detected fault.
• Battery room (electric and hybrid HSC): hydrogen ventilation, gas detection, lithium-ion fire-specific suppression.

Notable casualties

Sleipner casualty details

The MV Sleipner was a 86-metre Norwegian fast catamaran built in 1999 by FBM Marine in the UK, capable of carrying approximately 80 passengers and 90 cars at 32 knots. The casualty occurred on her maiden voyage from Haugesund to Bergen on the evening of 26 November 1999. Approximately 17 minutes into the voyage, the catamaran ran onto Bloksen, a charted submerged rock at the entrance to the Sandsfjorden.

The official investigation by the Norwegian Maritime Directorate found:

• The bridge crew had not been familiarised with the route to a sufficient depth.
• The route plan in the ECDIS was not appropriate for the speed at which the craft was being operated.
• The chief officer was relying on visual identification of navigation marks rather than on ECDIS-supported position monitoring.
• The master had taken the helm shortly before the casualty without a comprehensive briefing from the previous watch.
• The craft was running at full service speed in conditions where reduced speed would have been prudent.

The grounding produced rapid hull damage to both hulls, with progressive flooding through the wet deck space. The vessel began to list within minutes of the impact and sank in approximately 15 minutes.

Of the 80 persons on board, 16 perished. The post-incident review identified specific HSC failures:

• Inadequate bridge resource management at high speed, with insufficient cross-checking between bridge officers.
• Limited evacuation capacity under the rapid heel that developed (the lifeboat on the high side became unlaunchable, leaving evacuation to the rapidly-deployed liferafts on the low side).
• Crew evacuation training insufficient for the rapid-flooding scenario.
• Passenger life-jacket donning delayed by smoke from electrical fires and panic.

The casualty drove the 2000 HSC Code revision (entered into force 2002), which:

• Tightened bridge resource management requirements specifically for HSC operating in restricted waters.
• Added the operational requirement for routes to be pre-validated for the craft’s specific characteristics.
• Strengthened the master familiarisation requirements before commencement of route operation.
• Added MES requirements as a primary evacuation mode for Category A craft.
• Revised passenger evacuation procedures to address rapid-flooding scenarios.

MS Express Samina, 2000

The Greek catamaran MS Express Samina struck a small rocky islet (the Portes Rocks) at the entrance to Paros harbour on 26 September 2000 with 82 dead. The catamaran was running at 18 knots in heavy weather; the bridge officers had been distracted by the in-progress UEFA Champions League match (according to the investigation) and had failed to alter course in time. Although the casualty involved a fast ferry, the ship was technically classified as a roll-on roll-off passenger ferry rather than as an HSC under SOLAS Chapter X.

The Express Samina case illustrated:

• Bridge resource management failures at high commercial pressure.
• Inadequate crew evacuation procedures in a rapid-sinking scenario.
• Passenger evacuation challenges in heavy weather and darkness.

The casualty drove subsequent IMO consideration of fast ferries in the broader passenger ship safety framework, contributing to the post-Costa Concordia tightening of evacuation provisions.

Hovercraft incidents

Several hovercraft incidents during the 1990s and 2000s involved cushion-pressure loss in heavy weather, with consequences including capsize and engine room fires:

• British Hovercraft incidents: multiple hovercraft groundings and seal failures during the 1990s English Channel service.
• Norwegian Hovercraft incident, 2000: cushion-skirt damage on a Norwegian fjord hovercraft, with controlled stop and passenger evacuation.

The incidents drove tightening of hovercraft-specific stability and operational requirements within the HSC Code.

Hydrofoil incidents

The Boeing Jetfoil and other hydrofoils have a relatively strong safety record, with the principal incidents involving foil damage from floating debris. Modern hydrofoils have largely been replaced by catamarans for new-build fast ferry service, though Jetfoils remain in service in specific routes (Hong Kong-Macau, certain Japanese inter-island services).

Industry-led initiatives

In addition to the IMO regulatory cycle, HSC safety has been driven by industry-led initiatives:

• Interferry: the trade association for ferry and HSC operators, providing safety best-practice sharing, lessons-learned circulation, and IMO advocacy. Annual conferences include HSC-specific safety sessions.
• Maritime simulation training providers: organisations like Force Technology (Denmark), MARIN (Netherlands), HHI (Korea) operate HSC bridge simulators for crew training and route familiarisation.
• Manufacturer-led training: Incat, Austal, Damen and other major HSC builders provide type-rating training programmes for their craft, working with operators and flag-state authorities.
• Insurance industry pressure: P&I clubs covering HSC operators have specific risk-management programmes addressing common HSC failure modes.

Comparison with conventional ferry casualties

Bulk casualty statistics across HSC and conventional ferries show that:

• HSC fatality rate per passenger journey has historically been higher than for conventional ferries on similar routes, but has converged toward conventional rates as the HSC Code provisions have matured.
• HSC fatality rate per voyage is lower than conventional ferries because of shorter voyage durations.
• Specific failure modes differ: HSC casualties involve more grounding and collision (high-speed effects) while conventional ferry casualties involve more stability-related events (free-surface effect, hull damage).

The 2000 HSC Code revision addressed the early-phase HSC casualty cluster, and the post-2002 fleet has had an improved safety record proportional to the expanded operational discipline.

Documentation

Every HSC carries on board:

• HSC Safety Certificate: the primary certificate of compliance with the HSC Code.
• Permit to Operate: with route, weather and operational restrictions.
• HSC Code copy: applicable version (HSC 1994 or HSC 2000 Code), amended to current.
• Quality Management System Manual: operational procedures, including emergency response.
• Crew training records: STCW certificates plus type-rating records for the specific HSC.
• Maintenance and inspection records under the HSC-specific schedule.
• Voyage data recorder records (for HSC of significant size).
• Passenger safety briefing materials in multiple languages.
• Route plans and charts specific to authorised routes, kept current per Chapter V Regulation 27.
• Weather and shore-coordination records demonstrating compliance with the operational restrictions on the Permit to Operate.
• Pre-departure checklist completed for each voyage, with master sign-off.

Insurance and liability dimensions

HSC operations have specific insurance and liability characteristics:

• Hull and machinery insurance: HSC H&M premiums reflect the higher operational risk and higher capital cost relative to conventional ferries. Premiums vary substantially by route, by operator’s safety record, and by the specific HSC type.
• P&I cover: the major P&I clubs cover HSC operators, with specific guidance on HSC compliance and casualty management. The Sleipner and Express Samina casualties produced very large claims that have shaped P&I underwriting practice.
• Passenger liability: covered under the Athens Convention (where applicable) plus operator-specific terms. Athens Convention liability limits are a subject of ongoing IMO discussion, with periodic increases reflecting passenger protection priorities.
• War risks insurance: covers HSC against war and terrorism, particularly relevant for operators on routes through politically sensitive waters.

Operator-side risk management includes:

• Operational discipline: rigorous adherence to the Permit to Operate restrictions.
• Safety culture: employee reporting, incident analysis, continuous improvement.
• Master’s authority: clearly delineated authority to refuse sailing if conditions exceed Permit limits.
• Customer communication: clear cancellation and rescheduling procedures supporting master decisions, with proactive passenger advisories when conditions trigger operational restrictions.
• Multi-modal contingency planning: integration with conventional ferry alternatives, bus services or aircraft for passenger continuity when the HSC cannot operate.
• Insurance broker partnerships providing risk-management consultancy to HSC operators on best practice.

Type rating and route familiarisation

Type rating

Each HSC type is sufficiently distinctive that crew familiarised with one type may not safely operate another. The HSC Code therefore requires type rating for masters, chief officers and engineers:

• The type rating identifies the specific HSC class and model the holder is qualified to operate.
• The rating includes simulator training, in-service training under qualified supervision, and operational experience hours.
• Renewal at intervals (typically 2 to 5 years) requires demonstrated currency on the type, simulator-based revalidation, and any updated operational procedures.
• Multiple type ratings can be held simultaneously, but each requires its own currency demonstration.

The rating system is operationalised through:

• Manufacturer-specific training programmes: Incat, Austal, Damen, FBM and others provide initial type rating courses for their craft, working with operators and flag states.
• Operator-specific training programmes: large fleet operators (Stena, DFDS, TurboJET) maintain in-house training departments providing operational refinements above the manufacturer baseline.
• Maritime simulation centres: provide bridge simulator training for type rating and route familiarisation.

Route familiarisation

Beyond type rating, masters and chief officers operating HSC on a specific route must demonstrate route familiarisation:

• Initial route familiarisation: typically 5 to 10 voyages on the route under qualified supervision, covering a range of conditions (different weather, daylight and darkness, different traffic densities).
• Route documentation: detailed knowledge of route waypoints, navigation marks, hazards, refuge locations, communication arrangements.
• Local conditions awareness: tides, currents, weather patterns, traffic patterns, fishing activity, seasonal variations.
• Continuing currency: ongoing operation on the route to maintain familiarity.

The Sleipner casualty (1999) was a textbook failure of route familiarisation, with the bridge crew lacking sufficient knowledge of the specific hazards in the Sandsfjorden. The post-Sleipner amendments tightened the route familiarisation requirements significantly.

Search and rescue arrangements for HSC

HSC operating on Category A and Category B routes have specific SAR arrangements:

• Pre-arranged SAR resources: each route has identified rescue resources (coast guard, search and rescue helicopters, commercial vessels in the area, shore-based rescue services) with response time consistent with the route’s refuge limits.
• Communication coverage: continuous shore-side monitoring of HSC position via AIS, with capability to alert SAR resources within minutes.
• Drill coordination: HSC operators coordinate periodic SAR drills with shore-based response services.
• Casualty plan: each operator maintains a casualty response plan covering HSC distress scenarios, with shore-side notification and coordination.

The 4-hour and 8-hour refuge limits are calibrated to the response time of the SAR system in the relevant region. In areas with lower SAR density (Norwegian fjords north of the Arctic Circle, Pacific island routes), additional restrictions may apply.

Port state control of HSC

PSC inspections of HSC focus on:

• HSC Safety Certificate validity and amendment status.
• Permit to Operate alignment with the actual route and operational profile.
• Crew training and type-rating records, with verification that the master and chief officer have current type-rating endorsements for the specific HSC.
• QMS audit trail including incident reports, corrective actions, and continuous improvement.
• Maintenance and inspection records under the HSC-specific schedule.
• Bridge equipment functionality: VDR, AIS, ECDIS, radar, autopilot operation.
• Fire detection and extinguishing system operational tests.
• Life-saving equipment inspection: lifejackets, MES, liferafts, signal flares.
• Pre-departure checklist completion records.
• Route-specific operational restrictions verified against the Permit to Operate.

A serious deficiency in HSC compliance can result in detention with the requirement that the deficiency is rectified before sailing. Detention is recorded against the operator’s PSC profile, affecting future inspection priority.

Future of HSC under decarbonisation

The HSC sector faces specific challenges under the global decarbonisation agenda:

• High fuel consumption per passenger-mile at high speed creates a higher carbon footprint than conventional ferries on the same route.
• CII rating under MARPOL Annex VI: HSC operating at high speed may receive lower CII ratings than slower conventional ferries on similar routes.
• FuelEU Maritime (in force from 2025): well-to-wake greenhouse gas intensity reduction applies to HSC on EU routes, requiring fuel switching toward biofuels, methanol, hydrogen or electric.
• EU ETS (EU Emissions Trading System for shipping, in force from 2024): HSC operating between EU ports must purchase emissions allowances.

Operator responses include:

• Speed reduction: some HSC operators have reduced service speed by 5 to 10 knots to lower fuel consumption.
• Fleet renewal: new HSC are designed for lower fuel consumption per passenger-mile.
• Electric and hybrid HSC: rapid adoption on short routes.
• Biofuel use: some operators are transitioning to bio-MGO (marine gas oil derived from waste oils) or other low-carbon fuels.
• Hydrogen pilot projects: HSC using hydrogen fuel cells are entering pilot service from 2024 onward.

The HSC Code provisions in Chapter X interact with these decarbonisation drivers through:

• Type approval of new alternative-fuel HSC under HSC Code Chapter 9 (machinery) and the IGF Code under SOLAS Chapter II-1 Part G.
• Updated training requirements for crew operating alternative-fuel HSC.
• Updated operational restrictions where the alternative fuel imposes additional safety constraints.

Related Calculators

• SOLAS X/3, HSC Code applicability Calculator

See also

• SOLAS Convention parent article
• SOLAS Chapter II-1: Construction, Subdivision, Stability, Machinery and Electrical Installations
• SOLAS Chapter II-2: Fire Protection, Detection and Extinction
• SOLAS Chapter III: Life-Saving Appliances and Arrangements
• SOLAS Chapter V: Safety of Navigation
• Polar Code
• STCW Convention
• ISM Code

References

• IMO, International Convention for the Safety of Life at Sea (SOLAS), 1974, as amended, Chapter X.
• IMO, International Code of Safety for High-Speed Craft (HSC Code), Resolution MSC.36(63) (1994) and Resolution MSC.97(73) (2000), as amended.
• IMO MSC/Circ.1102 (2003), Guidelines for the operational requirements for high-speed craft.
• IACS Unified Requirements for High-Speed Craft Structure.
• NMA (Norwegian Maritime Authority) Investigation Report on MV Sleipner, 2000.