Cruise and Passenger-Ship Operations and Safety

A modern cruise ship is the most demanding passenger-safety problem afloat: a 365 metre hull, twenty decks, a fire load measured in thousands of cabins and public rooms, and close to 10,000 people who have to be kept alive whether the ship sails home or has to be emptied at sea. The regulatory answer is not one rule but a stack of them, and they interlock. SOLAS Chapter II-1 keeps the ship floating after damage; Chapter II-2 keeps a fire inside one zone; Chapter III gets everyone off if those fail; and the Safe Return to Port provisions added in 2010 try to make the ship its own best lifeboat so that abandonment becomes the last resort rather than the plan. This article is the hub for the cruise and passenger-ship operations cluster. It walks the safety regime from scale down to the operating margins, and it routes to the cluster’s working calculators: the cruise cabin noise limit check against the comfort-class ceiling, the pool water dispensing rate sizing, the provisions per passenger per day estimate, and the waste-water tank sizing calculation that governs how long the ship can hold sewage between discharges.

The passenger ship sits in its own legal category because the consequence of failure is set by headcount, not cargo value. SOLAS defines a passenger ship as one carrying more than twelve passengers, and from that single line flows the heavier construction, stability, fire, and life-saving regime that the rest of this page covers. The passenger ship article carries the definition and the regulatory map; this hub takes the operations and the engineering margins.

The scale problem: gross tonnage, berths, and the largest classes

Cruise ships are sized by enclosed volume, not weight, and the number that describes them is gross tonnage. GT is a dimensionless figure derived from the total enclosed volume of the ship under the 1969 International Convention on Tonnage Measurement of Ships, so a high-sided vessel full of cabins and atriums measures far larger than a low, dense cargo ship of the same displacement. A Capesize bulk carrier of around 180,000 tonnes deadweight measures roughly 100,000 GT; Royal Caribbean’s Icon of the Seas, which weighs a fraction as much in steel and load, measures about 248,663 GT. The tonnage measurement article explains why the two numbers diverge so sharply.

The growth in cruise scale has been steady and documented. Royal Caribbean’s Oasis class, starting with Oasis of the Seas in 2009, broke 225,000 GT and held the size record for over a decade at around 226,000 to 228,000 GT across the five ships. The Icon class took the record in January 2024 at roughly 248,663 GT and 365 metres, with a maximum near 7,600 passengers at full double-and-upper occupancy plus about 2,350 crew. That puts close to 10,000 people inside one hull, which is the figure that drives the evacuation arithmetic later on this page.

The headcount distinction that matters in design is the difference between lower-berth and maximum capacity. Lower-berth capacity counts two persons per cabin; maximum capacity counts the upper and sofa berths as well. The life-saving and Safe Return to Port provisions are sized against the maximum number of persons on board, crew included, because that is the worst case the ship must survive.

The trend also pushes the regulatory thresholds in one direction. Every ship in the large, mega, and largest tiers clears 120 metres and runs well past three main vertical fire zones, so the entire modern cruise fleet built since 2010 falls inside the Safe Return to Port regime by length and zone count alike. The thresholds were set where they were precisely because a ship of that size is too large to treat as a simple abandon-and-launch problem. The growth in berths has therefore not outrun the rules; the rules were written against the direction the ships were already heading, and each new class is designed to the regime from the first general-arrangement drawing rather than retrofitted to it.

The tiers are not regulatory categories; SOLAS draws its lines on length, zone count, and build date, not GT. They matter operationally because crew ratios, provisioning, fresh-water generation, and waste handling all scale with persons aboard rather than tonnage. A ship near 10,000 people aboard runs a small municipal utility: the provisions per passenger per day calculator sizes the food load, and the waste-water tank sizing calculator sizes the holding capacity that decides how far from a discharge-permitted area the ship can operate.

How the passenger-safety regime was built

The passenger-ship regime is a record of disasters answered by rule changes, and the dates matter because each one fixed a specific failure. SOLAS itself began as the response to the loss of the Titanic on 14 April 1912, when a ship with lifeboat capacity for about 1,178 against roughly 2,224 aboard sank with about 1,500 dead. The first SOLAS Convention of 1914 set the principle that survival-craft capacity must match the persons carried, the principle that still drives the Chapter III headcount arithmetic. The convention has been recast several times since, the current instrument being SOLAS 1974 as amended, which carries the tacit-acceptance procedure that lets the IMO update the technical chapters without reopening the whole treaty.

The modern passenger provisions trace to specific casualties. The Herald of Free Enterprise capsize off Zeebrugge in March 1987, with 193 dead, came from sailing with the bow doors open and water flooding the vehicle deck, and it drove the work on ro-ro stability that became the Stockholm Agreement after the Estonia loss in September 1994 killed 852. The Scandinavian Star fire in April 1990, with 159 dead, sharpened the fire-protection and escape provisions. The Costa Concordia grounding off Giglio in January 2012, with 32 dead, exposed gaps in muster timing and abandonment command, and prompted both the CLIA muster-before-departure policy and a wider IMO review of passenger-ship safety. Each rule on this page is anchored to one of these events rather than written in the abstract.

The Safe Return to Port provisions were the first to invert the older logic. Before MSC.216(82), the design assumption was that a serious casualty meant abandoning to the boats, so the rules concentrated on launching survival craft fast. The post-2010 logic is that a 300-metre ship with thousands aboard is a worse place to leave than to stay, provided the ship can keep itself habitable and moving, so the design effort shifted to keeping the essential systems alive after a casualty. The shift is visible in the redundancy of a modern cruise newbuilding: split machinery spaces, duplicated switchboards, and segregated cable runs that exist to satisfy the casualty-threshold case.

The SOLAS passenger-ship regime

Passenger ships carry the heaviest treaty load in SOLAS because the failure mode is mass casualty. The regime rests on three chapters that each handle a different failure and are written to back each other up. Chapter II-1 covers construction, subdivision, and stability, so the ship stays upright and afloat after a hull breach. Chapter II-2 covers fire protection, detection, and extinction, so a fire stays contained. Chapter III covers life-saving appliances and arrangements, so the people get off if containment and flotation both fail.

Passenger ships also carry obligations that cargo ships do not. They undergo an annual passenger-ship safety survey and hold a Passenger Ship Safety Certificate valid for no more than twelve months, against the cargo-ship norm of up to five years between renewal surveys with annual endorsements. The shorter cycle reflects the consequence of an undetected defect. The certificate covers hull, machinery, stability information, fire safety, and life-saving, and a single expired or invalid certificate can detain the ship.

The chapters interlock by design. A fire that Chapter II-2 fails to contain triggers the Chapter III evacuation; a hull breach that exceeds the Chapter II-1 subdivision standard does the same. Safe Return to Port, added in 2010, sits across all three: it tries to keep the ship a viable refuge after a casualty so the Chapter III evacuation is delayed or avoided. The SOLAS Chapter II-1, SOLAS Chapter II-2, and SOLAS Chapter III articles take each chapter in full; this hub takes the parts that bind specifically to passenger operations.

Safe Return to Port: the ship as its own best lifeboat

The Safe Return to Port philosophy reverses the older assumption that the lifeboats are the answer to a casualty. After a survivable fire or a single-compartment flood, a large modern passenger ship is a safer place than a lifeboat in an open seaway, so the design objective became keeping the ship habitable and able to sail itself home. The principle is usually stated as the ship being its own best lifeboat. It was given regulatory force by resolution MSC.216(82), adopted in December 2006 and in force from 1 July 2010, which added regulations II-2/21 and II-2/22 and the supporting II-1/8-1.

The applicability is set by size, not trade. The provisions apply to passenger ships of 120 metres or more in length, or having three or more main vertical fire zones, constructed on or after 1 July 2010. That captures large cruise ships, ro-pax ferries, and special-purpose passenger craft above the threshold; it does not turn on whether the ship carries vehicles. A 365 metre cruise ship and a 180 metre ro-pax ferry are both inside it.

The mechanism turns on the casualty threshold, regulation II-2/21. The threshold is the boundary between two design cases the same ship must satisfy. In the first case, the ship suffers a fire casualty that does not exceed the threshold, or the flooding of any single watertight compartment, and a defined set of essential systems must stay operational so the ship can return to port under its own power with passengers aboard. The systems that must survive include propulsion, steering and steering control, navigation, fuel and lubricating-oil transfer, internal and external communication, fire main, fixed firefighting, bilge and ballast, and the lighting, sanitation, and ventilation needed to keep the protected spaces habitable.

In the second case, the casualty exceeds the threshold. The objective then switches from sailing home to orderly evacuation. Regulation II-2/22 requires a more limited set of systems to remain operational for at least three hours, evaluated for the loss of one entire main vertical zone, to support mustering and abandonment. Those systems cover the fire main, communications and the public-address system, lighting along escape routes and at assembly stations, bilge pumping for managing flooding, and the means to launch the survival craft. The three-hour window is the design figure for how long the ship must support evacuation after the threshold is breached.

Both cases share the concept of the safe area: a part of the ship, inside or outside the casualty-affected zone, where passengers and crew can shelter with the basic services, water, ventilation, sanitation, medical care, and protection from heat and smoke, that keep them safe while the ship returns or is evacuated. The safe area is not a fixed room; it is a capability the design has to provide, sized to the persons on board. The Safe Return to Port analysis is one of the harder pieces of a modern passenger newbuilding because it forces redundancy and physical separation into systems that older ships ran as single chains.

Demonstrating compliance is an engineering exercise in its own right. The builder has to identify every essential system, trace its cabling, piping, and supporting services through the ship, and show by analysis that after the defined fire casualty or the single-compartment flood the surviving routes still feed the systems that must stay alive. That usually forces two physically separate engine rooms with independent switchboards, duplicated steering-gear feeds, and cable runs routed so that no single zone loss takes out both halves of a redundant pair. The verification is documented in a Safe Return to Port capability plan that the flag state and class society review before the ship enters service, and the same plan defines what the crew can expect to keep running after a casualty, which feeds the emergency procedures and the bridge decision on whether to sail home or evacuate.

Damage stability: probabilistic SOLAS 2009 and the Stockholm Agreement

A passenger ship that cannot stay upright after a breach defeats every other provision, so damage stability is the foundation. Ships built on or after 1 January 2009 are assessed under the probabilistic method in the revised SOLAS Chapter II-1, which replaced the older deterministic two-compartment rule. The method computes an attained subdivision index A, a probability-weighted measure of how well the ship survives the statistical range of damage cases, and requires A to be at least the required index R. The probabilistic damage stability article works the index arithmetic, and the broader damage stability article sets it against intact survival.

R is set by the number of persons the ship can carry, which is why cruise ships sit at the demanding end of the scale. For passenger ships R rises steeply with persons aboard, so a ship carrying several thousand passengers must reach a high A, typically above 0.8, far above the value a small cargo ship needs. Designers reach it by stacking many watertight compartments along the length, fitting double sides and a double bottom, arranging cross-flooding so a side breach floods symmetrically rather than listing the ship, and controlling the openings in the watertight subdivision. The relationship to intact behaviour matters too: a ship with poor intact stability has no reserve to spend on damage, and the loading computer onboard tracks both, as the marine stability booklet and loading computer article describes.

Ro-ro passenger ships carry a regional standard on top of the SOLAS baseline. The Stockholm Agreement, signed in Stockholm in February 1996 by eight northwest European states, Denmark, Finland, Germany, Ireland, the Netherlands, Norway, Sweden, and the United Kingdom, was the response to the loss of the Estonia in September 1994 with 852 dead. It adds an explicit water-on-deck stability case: the ship must resist capsize with water accumulated on the ro-ro deck to a level up to 0.5 metre, evaluated across significant wave heights between 1.5 and 4 metres depending on the operating area. The standard is complementary to the SOLAS 90 subdivision standard, not a replacement, and it applies to ro-ro passenger ships on regular international voyages between designated ports in the covered area regardless of flag. The European Union gave it legal force across member states through Directive 2003/25/EC.

The water-on-deck case targets the specific failure that killed the Herald of Free Enterprise off Zeebrugge in March 1987 and the Estonia in the Baltic: water entering the vehicle deck through a bow or side opening forms a large free surface that has no internal subdivision to stop it, the metacentric height collapses, and the ship lists and capsizes within minutes. A pure cruise ship has no through vehicle deck, so it does not face the Stockholm case; its hull is subdivided full height. This is the sharpest engineering line between the ro-pax and cruise types, and the specialised ship types article sets the ro-ro configuration against other hull forms.

The free-surface mechanism is worth stating in the numbers that make it dangerous. A flat sheet of water 0.5 metre deep across a 30 metre wide vehicle deck weighs hundreds of tonnes and shifts to the low side the instant the ship heels, moving its centre of gravity outboard and adding a heeling moment that grows with the angle. The effect reads as a loss of metacentric height GM, and on a ship that started with a modest GM the residual righting arm can vanish at a small heel. That is why the Stockholm case is evaluated as a separate survival condition rather than folded into the ordinary subdivision calculation: the trapped water is not a fixed flooded compartment but a free surface whose moment depends on the heel angle the ship reaches.

Righting arms and the survival criterion

Damage survival is judged on the residual righting-arm curve, the plot of righting lever GZ against heel angle in the damaged condition. SOLAS II-1 sets minimum values for the range of positive stability, the peak GZ, and the area under the curve in each damage case, and a passenger ship must also keep the maximum heel within limits set so that escape routes and embarkation stations stay usable. The probabilistic index A is, in effect, the sum across all the statistical damage cases of the probability that the damage occurs multiplied by the probability that the ship survives it, weighted by the loading conditions. The geometry behind GZ runs through the cross curves of stability and KN tables article, which is the data the loading computer interpolates to build the curve for the actual displacement and KG.

The practical consequence for a cruise design is that subdivision and stability are decided together at the earliest stage. Watertight compartment lengths, the height of the bulkhead deck, the position of the double-side void, and the cross-flooding ducts are fixed before the accommodation layout is locked, because moving a main watertight bulkhead after the fact changes the attained index A for every damage case that touches it. The naval-architecture coefficients that describe the hull form, block coefficient and the rest, feed the same calculation; the naval architecture coefficients article carries those definitions.

Life-saving appliances and evacuation analysis

SOLAS Chapter III sizes the means of getting everyone off and proves the arrangement works in time. Survival-craft capacity must cover the total persons on board, and on passenger ships the lifeboats and liferafts are arranged so that the required capacity is reachable from the assembly stations even with one craft or one launching point lost. Lifeboats on passenger ships are typically of the partly or totally enclosed type, and a single modern passenger-ship lifeboat can hold up to 150 persons under the LSA Code, which is how a ship of several thousand reaches its capacity without an impractical number of boats.

The largest cruise ships push past the practical limit of davit-launched lifeboats alone, so they rely on marine evacuation systems for a large share of the capacity. An MES is a chute or slide from an embarkation deck down to a self-inflating platform and liferafts at the waterline, letting passengers descend without climbing into a boat at height. A single MES station can evacuate several hundred people, and the systems are arranged port and starboard so capacity survives a list to one side. The arrangement has to work fast.

SOLAS sets the abandonment target in time, not just in capacity. The survival craft for total abandonment must be capable of being boarded and launched within 30 minutes from the moment the abandon-ship signal is given, after all persons have been mustered with lifejackets on. For passenger ships the arrangement is validated by an evacuation analysis under the IMO guidelines, which models how long the crowd takes to move from cabins and public spaces to the assembly stations along the actual escape routes, accounting for stair widths, counter-flows, and the response time of passengers who may be asleep or unfamiliar with the ship. The analysis can drive design changes, wider stairs, repositioned assembly stations, before the ship is built. The SOLAS Chapter III article carries the appliance specifications and the launching standards in full.

The capacity arithmetic on a large ship is unforgiving. A ship with 10,000 persons aboard needs survival-craft capacity for all of them plus the margin the rules require, and even at 150 persons per lifeboat that is dozens of boats, more than the ship’s side can carry on davits at a height passengers can board safely. The design answer is to split the load: lifeboats carry part of the capacity, marine evacuation systems and their liferafts carry the rest, and the whole arrangement is duplicated port and starboard so a list to one side does not strand the capacity on the high side that cannot be launched. The rules also require survival craft to be boardable and launchable with the ship listed up to a set angle and trimmed, because a real casualty rarely leaves the ship upright. SOLAS sets the survival-craft and rescue-boat embarkation arrangements so that boarding works with the ship listed up to 20 degrees either way.

Lifejackets and immersion protection are sized the same way. A passenger ship carries a lifejacket for every person aboard plus a percentage of spares, with additional child and infant sizes proportioned to the expected passenger mix, and the jackets are stowed where the muster list sends people rather than only at the boats. The lifeboats themselves carry water, rations, and signalling equipment under the LSA Code so that survivors can last until rescue, which on a remote itinerary may be many hours. The point of the whole chapter is that capacity, time, and the realistic damaged condition of the ship are designed together, not signed off separately.

Muster, drills, and the human procedure

The hardware is only as good as the procedure that puts people in front of it. SOLAS Chapter III requires that every passenger receive safety information, and the muster, the assembly of passengers at their stations, has to be completed before the ship sails or shortly after, within 24 hours of embarkation under the convention. After the Costa Concordia grounding off Giglio in January 2012, in which the muster for newly embarked passengers had not yet taken place when the ship struck, the Cruise Lines International Association adopted a Muster Drill Policy committing its member lines to hold the muster before departure from port. CLIA’s safety policies sit on top of the SOLAS minimum, not in place of it.

The crew side is drilled continuously. SOLAS requires abandon-ship and fire drills at intervals, and on passenger ships an abandon-ship drill and a fire drill must be held weekly where the voyage pattern allows, with each crew member taking part in at least one of each every month. The drills exercise the muster lists, the donning of lifejackets, the lowering of at least one lifeboat in turn, the starting of the survival-craft engines, and the operation of the davits and the MES. The point is that the 30-minute abandonment figure is achievable only with a crew that has rehearsed the actual stations and routes, not read them off a list.

The muster list itself is a regulated document, not a notice board. SOLAS Chapter III requires every passenger ship to carry a muster list that assigns each crew member a specific emergency duty, the station to report to, the survival craft to operate, and the role in mustering and controlling passengers, with the duties written so that the essential ones are covered even with part of the crew absent or incapacitated. Passenger cabins carry instructions showing the assembly station and the escape route, and the alarm signals are standardised so that the same general-emergency signal, seven or more short blasts followed by one long blast on the ship’s whistle and the alarm system, means the same thing on any ship. The crowd-management and crisis-management training that the STCW special-training requirements set for passenger-ship crew exist because moving thousands of unfamiliar people is a skill, not an instinct; the STCW Convention hub carries the wider competence framework.

The lesson the casualties keep returning is that the procedure fails before the hardware does. At Zeebrugge the bow doors were open because the assistant bosun responsible was asleep and no positive check confirmed closure before the ship sailed; the lifeboats were never the problem. The post-Concordia muster-timing change addressed the same class of failure: the equipment was sufficient, but passengers who had not yet been mustered did not know where to go. The drills and the muster list are the controls that close that gap, which is why the convention prescribes their frequency and content rather than leaving them to the operator.

Fire safety: main vertical zones and structural containment

Fire is the casualty a cruise ship is most likely to face, and the containment strategy is geometric. SOLAS Chapter II-2 divides the ship’s length into main vertical zones bounded by A-class fire-rated bulkheads and decks, each zone no longer than 48 metres in general, so a fire that starts in one zone is held there while the rest of the ship stays usable. The zone count is also the trigger that brings the larger fire-safety and Safe Return to Port rules to bear: a ship with three or more main vertical zones is large enough that the regime treats a whole-zone loss as the design case.

The boundaries are backed by detection, suppression, and control. Passenger ships carry fixed fire-detection and alarm systems covering accommodation, service spaces, and control stations, addressable so the bridge sees the exact location; sprinkler systems in accommodation and public spaces; fixed gas or water-mist systems in machinery spaces; and structural insulation rated to hold a fire for a set period at the zone boundaries. The SOLAS Chapter II-2 and marine fire detection and fixed fire-fighting systems articles carry the system detail. The zone concept is what lets Safe Return to Port define its second case as the loss of one entire main vertical zone: the ship is built so that losing one zone is survivable, and the rules then require the remaining systems to support evacuation for three hours.

Hotel load and the ship as a floating utility

A cruise ship near 10,000 people aboard runs the services of a small town with no shore connection for days at a time, and those hotel systems are sized against persons aboard rather than tonnage. Fresh water is the first constraint: a ship typically generates its own through reverse-osmosis plants and evaporators rather than carrying it, because a town-sized population at 200 to 400 litres per person per day for drinking, washing, galley, and pools would otherwise need thousands of tonnes of tankage. The generation rate has to cover the daily draw plus a reserve, and the pool water dispensing rate calculation sits inside that water budget, sizing the make-up flow that keeps a pool turned over without draining the potable supply.

Waste handling is the matching constraint at the other end. A passenger ship produces black water, sewage, and grey water from galleys, laundries, and showers, and MARPOL Annex IV restricts where treated and untreated sewage may be discharged relative to the nearest land, with stricter rules in special areas such as the Baltic, as the Annex IV Reg.11 sewage discharge article sets out. The ship therefore needs holding capacity sized so it can operate through the no-discharge legs of its itinerary, which is exactly what the waste-water tank sizing calculation establishes: the tank volume that lets a given population run for a given number of days before it must reach a discharge-permitted area or a port reception facility. Undersize the tank and the itinerary is constrained; oversize it and the volume is taken from revenue space.

Provisioning is a logistics problem on the same scale. Food, beverage, and consumable stores for a voyage of days or weeks have to be loaded in the few hours of a turnaround call, so the per-person daily figures the provisions per passenger per day calculation produces drive both the storeroom and reefer-space sizing and the dock-side logistics of a turnaround. Crew accommodation, medical facilities, and the comfort standards that govern cabins all scale the same way. Cabin comfort includes a noise ceiling: the classification-society comfort notations set maximum sound levels in passenger cabins, often around 44 to 49 dB(A) for the higher comfort classes, and the cruise cabin noise limit calculation checks a measured or predicted level against that class ceiling. These utility loads are not safety regulation, but they decide how far and how long a ship can operate, and they share the persons-aboard variable with the life-saving provisions.

Ro-pax and cruise: the same regime, two risk profiles

Ro-pax and cruise ships are both passenger ships under SOLAS, but the dominant hazard differs, and the differences drive distinct rules. The ro-pax ship is built around a long vehicle deck that has to stay open for roll-on roll-off loading, so it carries the Stockholm Agreement water-on-deck stability case and a fire risk concentrated in a space full of fuelled vehicles. The cruise ship has no through vehicle deck; its hazard is the fire load of thousands of cabins and the evacuation of a town-sized population from a tall hull, which is why it drives the Safe Return to Port and large-scale evacuation provisions hardest.

The operating patterns diverge too. A ro-pax ferry runs short, frequent, scheduled crossings with a passenger population that turns over several times a day and rarely sees a muster, which is why the pre-departure safety information has to be brief and visible. A cruise ship runs voyages of days or weeks with a stable population that is mustered once at the start, and it operates as a self-contained utility for that whole period: generating fresh water, dispensing pool and spa water under the rate the pool water dispensing rate calculator checks, holding sewage and grey water against the waste-water tank sizing limit, and meeting cabin comfort standards including the noise ceiling the cruise cabin noise limit calculator tests against the class comfort notation. Both ship types are passenger ships first, but the engineering and operating margins are set by which hazard dominates.

These specialised passenger operations connect to the wider offshore and specialised-vessel work in the offshore, cruise, and specialised operations hub, and the underlying hull and stability engineering runs through the SOLAS Chapter II-1 and damage stability articles.

Limitations

This article is a hub overview of the cruise and passenger-ship safety regime, not a compliance manual. The thresholds stated, the 120 metre length, three main vertical zones, the 1 July 2010 and 1 January 2009 build dates, the 30-minute abandonment target, and the three-hour Safe Return to Port window, are the headline figures; the operative requirements live in the full text of SOLAS Chapters II-1, II-2, and III, in resolution MSC.216(82), and in the associated IMO guidelines and the LSA and FSS Codes, which contain definitions, exceptions, and detailed performance standards this page does not reproduce. The probabilistic damage-stability indices A and R depend on ship-specific geometry and persons-aboard figures and must be computed for the actual hull. The Stockholm Agreement applies regionally in northwest Europe and through Directive 2003/25/EC in the European Union; ships outside that trade meet the SOLAS subdivision standard without the water-on-deck case. Class-society rules, flag-state instructions, and the ship’s approved stability and fire-safety documentation govern any actual design or operation. Verify every figure against the current consolidated SOLAS text and the ship’s certificates before relying on it.

See also

• Passenger ship: SOLAS definition and safety rules
• SOLAS Chapter II-1: construction, subdivision, and stability
• SOLAS Chapter II-2: fire protection, detection, and extinction
• SOLAS Chapter III: life-saving appliances and arrangements
• Probabilistic damage stability
• Damage stability
• Specialised ship types: ro-ro, reefer, heavy-lift
• Tonnage measurement of ships
• Offshore, cruise, and specialised operations
• Cruise cabin noise limit calculator
• Cruise pool water dispensing rate calculator
• Cruise provisions per passenger per day calculator
• Cruise waste-water tank sizing calculator