Allarme Angolo di Deriva
Navigation sensor alert triggered when vessel’s leeway or sideslip exceeds predefined safe threshold relative to track.
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Maneuvering
Browse Maneuvering terms for maritime professionals.
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Allarme Profondità Acqua
An alert activated when the measured depth beneath a vessel approaches a pre-set minimum, used to avoid grounding.
View termAllarme Sincronizzazione Timone
An alert indicating a mismatch between helm (steering wheel) position and rudder angle, requiring immediate attention to prevent loss of steering control.
View termAllarme Velocità Poppa
An alarm triggered when a vessel's sternway (reverse movement) exceeds a preset speed threshold, alerting crew to possible navigational hazards during astern operations.
View termAngolo di Deriva Controllato
Intentional small leeway angle set between vessel heading and track to counter cross-wind or current during approach.
View termAnnulla Determinazione Posizione
Command to discontinue planned position fixing process when results are unreliable or time-critical manoeuvre takes priority.
View termArresto del Propulsore
The process of safely reducing thruster power and shutting down the units after manoeuvring or while leaving station keeping mode.
View termAssorbimento di Energia dei Parabordi
Capacity of berth fender system to absorb kinetic energy of vessel at specified berthing velocity without exceeding design deflection.
View termAusilio Elettronico all'Ormeggio
Shore-based microwave or laser sensor system providing real-time range, closing speed, and alignment data to approaching vessel.
View termAvvio del Propulsore
A procedure where thrusters are gradually powered up and tested before being engaged for manoeuvring or station keeping.
View termAvviso Zona di Interazione
Advisory issued when proximity of shallow banks or passing vessels may cause hydrodynamic interaction affecting steering and under-keel clearance.
View termBlocco del Telegrafo di Macchina
A failure or obstruction in the engine telegraph system, preventing bridge orders from being transmitted to the engine room or vice versa.
View termBlocco Elica Azimutale
A system state where azimuth thrusters are held in a fixed orientation to prevent movement, usually for safety during maintenance or when not required for manoeuvring.
View termBudget Energetico Ormeggio
The total kinetic energy allowed for a vessel to safely berth, accounting for mass, speed, and fender capacity to prevent damage.
View termCalcolo della Distanza di Avanzamento
Determination of the longitudinal distance the vessel travels on the original heading during a turn from rudder order until reaching new course.
View termCambio Punto di Traino Rimorchiatore
The coordinated operation in which a tug alters its line connection point or position to adapt to new towage requirements during berthing or unberthing.
View termCapacità di Tiro del Cabestano
Maximum continuous line-pull that a deck capstan can exert when hauling mooring lines at rated speed.
View termCiclo di Feedback del Timone
A control system that continually monitors rudder position and vessel heading to automatically correct steering and maintain set course.
View termCoefficiente di Efficienza del Thruster
A calculated ratio indicating how effectively a vessel’s thruster converts power input into thrust for manoeuvring operations.
View termCoefficiente Momento di Prua
A calculated factor describing the turning moment generated by the bow, crucial for assessing vessel manoeuvrability during pilotage and berthing operations.
View termColpo di Spinta Inversa
A short, controlled burst of astern propulsion to quickly reduce a vessel’s forward speed or stop movement during precise manoeuvring.
View termCompensazione del Momento di Imbardata
Adjustment of rudder angle, thruster output, or tug forces to counteract undesired yawing moments during low-speed manoeuvres.
View termCompensazione della Densità dell’Acqua
The adjustment made to vessel loading or draught calculations to account for local water density, affecting buoyancy and safe draft.
View termCompensazione Ritardo Comando
Systematic adjustment made to navigation or machinery commands to account for time lag between order and vessel response, ensuring precise manoeuvring.
View termContatto con Pannello Parabordi
The point or process where the vessel's hull makes contact with the berth fender panel, usually monitored to avoid structural damage.
View termControllo del Momento di Beccheggio
The regulation of longitudinal pitching moments of a vessel, using ballast or thrusters, to ensure stability and reduce motion in varying sea states.
View termControllo del Momento di Reversione
Verification that astern power has arrested forward momentum before changing engine orders during docking sequence.
View termControllo del Moto di Surge
Management of longitudinal oscillations of vessel while moored, using winch tension adjustments or tug assistance to prevent contact damage.
View termControllo della Deriva Laterale
Active steering or thruster management to prevent a vessel from swinging away (sheering off) from its intended track or berth during approach.
View termControllo della Protezione dell’Elica
Inspection of the propeller guard for integrity and correct positioning before manoeuvring or departure, ensuring safe protection against entanglement or damage.
View termControllo della Traiettoria di Avvicinamento
Continuous monitoring and adjustment of a vessel’s approach trajectory to the berth, ensuring a smooth, controlled entry under varying environmental forces.
View termControllo dell’Inerzia Inversa
Verification manoeuvre carried out to ensure the vessel’s astern power can promptly overcome residual forward momentum before final approach or emergency stop.
View termControllo Velocità Rotazione Prora
Autopilot or manual feedback setting that governs how rapidly the vessel’s heading may change, expressed in degrees per minute.
View termCorrente Trasversale di Canale
Lateral water flow across a dredged channel causing set and drift that must be compensated during navigation.
View termCorrezione dell'Angolo di Anticipo
Adjustment applied to ship’s heading to offset predicted set and drift so that actual track leads planned approach line.
View termCorrezione della Tendenza di Virata
The adjustment made to compensate for a vessel’s natural tendency to turn more easily in one direction due to hull design, wind, or propeller effect.
View termDistanza di Arresto di Emergenza
Measured distance travelled from full ahead to complete stop using maximum astern power and rudder amidships.
View termEffetto Trasversale dell’Elica
Side-force generated by propeller rotation causing yaw, especially stern kick to port or starboard when powering ahead or astern.
View termImpulso di Potenza Incrementale
A technique involving small, timed increases in engine or thruster power to control a vessel’s position or heading precisely during docking or undocking.
View termIndicatore Distanza Avvicinamento
Painted, lit, or electronic reference indicating remaining longitudinal distance to berth face during final approach.
View termIntegrazione delle Superfici di Controllo
The coordinated operation of rudders, stabilisers, and other movable surfaces to achieve optimal vessel steering and stability.
View termLimitatore dell’Angolo di Timone
Device or setting restricting maximum rudder angle to prevent over-steer at speed or protect steering gear.
View termLimite di Velocità di Ormeggio
Maximum allowable approach speed normal to berth to prevent fender overload and structural damage.
View termLuci di Allineamento Banchina
Pair or range of fixed shore lights that provide visual guidance to vessels for centreline alignment during final approach to berth.
View termManovra di Arresto Rapido
Emergency procedure whereby engine is set full astern and helm hard over to rapidly stop vessel’s forward motion within minimum distance.
View termMantenimento Posizionamento Dinamico
A control mode where a vessel maintains its heading and position automatically using thrusters and propellers, essential for offshore operations and station keeping.
View termMantenimento Velocità Zero
A function in vessel control systems where speed is automatically kept at zero, holding position against wind, current, and drift, without anchoring.
View termMisurazione Doppler Acustica
A navigational process using Doppler sonar to measure vessel speed and direction relative to water, crucial for precise manoeuvring and dynamic positioning.
View termModalità Calcolo Slittamento
A navigational mode where a vessel’s slip—the difference between theoretical and actual movement—is monitored and calculated for safe manoeuvring, especially in current-affected waters.
View termModalità Manovra Joystick
A control setting that allows a vessel to be steered and positioned using a joystick, integrating thrusters and main propulsion for precision movement, especially during berthing.
View termModalità Stabilizzazione Tasso
Autopilot setting that dampens oscillations by keeping rate of turn constant once a target value is reached during manoeuvre.
View termModello di Assegnazione della Spinta
A computational approach for optimally distributing propulsion thrust among multiple thrusters to achieve desired vessel motion and heading.
View termMonitoraggio della Tensione di Ormeggio
Real-time supervision of static and dynamic loads on mooring lines to maintain safe tension limits under environmental forces.
View termMonitoraggio dell’Angolo di Deriva Laterale
Continuous observation of vessel’s lateral drift angle relative to track to ensure safe approach trajectory during docking.
View termOrmeggio con Vento Forte
A berthing operation performed in high wind conditions, requiring specific techniques, increased tug assistance, or thruster use to maintain control and safety.
View termPasso Negativo dell’Elica CPP
A controllable pitch propeller blade setting that provides astern thrust for stopping or reversing the vessel.
View termPasso Positivo dell’Elica CPP
A controllable pitch propeller blade setting that provides forward thrust, the amount adjusted for desired vessel speed and power.
View termPasso Zero dell’Elica CPP
The position of a controllable pitch propeller (CPP) where the blades are aligned to produce no thrust, used for stopping or neutral operation.
View termPendenza della Rampa d’Ormeggio
The measured incline of a docking ramp, influencing the safe entry, exit, and support of a vessel during docking or undocking.
View termPerdita di Efficacia del Timone
Reduction in steering response due to low water flow over rudder, cavitation, or mechanical limitation.
View termPiano Compensazione Forza Laterale
A navigational strategy to counteract lateral forces (wind, current, propeller wash) that may cause a vessel to drift sideways during berthing or channel transit.
View termPredittore di Tasso di Virata
ECDIS or radar-derived graphic that projects vessel’s future position based on present speed and rate of turn settings.
View termResistenza di Flusso Viscoso
The resistance experienced by a vessel as it moves through water due to the fluid’s internal friction, affecting speed and fuel efficiency.
View termRichiesta Assistenza Rimorchiatori
Formal VHF or written message from vessel or pilot to harbour authority asking for specified tug support for manoeuvring.
View termRiduzione Velocità di Ancoraggio
Deliberate decrease in vessel speed to a safe limit before anchor deployment, minimizing anchor dragging and ensuring proper holding.
View termRilievo del Margine Sotto Chiglia
Hydrographic assessment confirming minimum clearance between keel and seabed along planned passage meets safety criteria.
View termRiserva di Potenza Indietro
Remaining astern propulsion capacity beyond that required for standard manoeuvre, ensuring additional stopping margin.
View termRisposta al Carico del Motore
The manner and speed at which the main engine adapts to sudden changes in power demand, crucial for manoeuvring and heavy weather operation.
View termSincronizzazione del Passo dell’Elica
Matching of pitch angles on controllable-pitch propellers to balance thrust and avoid yaw during twin-screw operations.
View termSistema di Ormeggio Laser
High-precision laser array projecting range and angular deviation data to vessel displays for centimetre-level berthing accuracy.
View termSpazio Libero Wing Plancia
Minimum air gap required between ship’s bridge wing extremities and shore structures or lock walls during manoeuvring.
View termSpinta Inversa Idrogetto
A manoeuvring action where the direction of waterjet propulsion is reversed, providing astern thrust for stopping or moving the vessel backwards.
View termStima del Periodo di Rollio
An evaluation of the time taken for a vessel to complete one full roll oscillation, essential for stability analysis and safe loading.
View termStima del Punto di Rotazione
Calculation of the vessel’s instantaneous longitudinal pivot point to predict turn characteristics in low-speed manoeuvring.
View termStima Effetto Cuscino
An assessment of the air or water pressure that builds up between a vessel and the berth or another vessel, influencing manoeuvring dynamics during close approach.
View termStima Effetto di Aspirazione
The assessment of negative pressure that draws a vessel toward another object or structure during close-quarter manoeuvring, affecting control and safety.
View termStrategia di Controllo dell’Inerzia
The procedure and logic used to manage a vessel's inertia during changes in speed or heading, optimizing response time and safety during close-quarters manoeuvring.
View termTensione della Cima del Rimorchiatore
The force applied to a tow or mooring line connecting a tug to a vessel, monitored to ensure safe and effective manoeuvring or holding.
View termTenuta Freno Verricello
Certified static load that a mooring-winch brake can safely withstand without paying out when lines are under tension.
View termTracciato di Avvicinamento alla Scivola
The planned or observed vessel path when aligning for entry onto a slipway, critical for safe launching or hauling operations.
View termUnità di Riferimento del Movimento
A device that detects and reports a vessel’s six degrees of motion, used to support dynamic positioning and other navigational systems.
View termUtilizzo del Bow Thruster
Use of bow thruster to generate lateral force at bow for precise positioning or counteracting environmental forces during manoeuvring.
View termValutazione del Camminamento dell’Elica
Evaluation of sideways movement (walk) caused by propeller rotation while making headway or sternway at low speed.
View termValutazione del Diametro Tattico
Assessment of the vessel’s maximum transverse distance travelled during a turning circle with constant rudder angle at full speed.
View termVariazione Trim Idrostatico
Change in a vessel’s longitudinal trim resulting from variations in hydrostatic forces due to ballast, cargo, or water density changes.
View termVerifica del Bollard Pull
Confirmation that a tug’s certified bollard-pull matches terminal requirements before allocating towage tasks.
View termVerifica della Libera Rotta del Davit
Process of ensuring the davit’s operational path is free of obstruction and ready for safe lifeboat launching or recovery.
View termVerifica della Traccia di Avvicinamento
Confirmation that vessel’s intended approach line aligns with planned track and pilot’s instructions before final manoeuvring.
View termVerifica Idoneità Ormeggio
A verification process to ensure the selected berth meets vessel requirements in terms of depth, length, fendering, and operational limits before mooring.
View termVibrazione Torsionale dell’Albero
Oscillation in the propulsion shaft caused by variations in torque, potentially leading to machinery damage if not controlled.
View term