अंडरकील मार्जिन सर्वे
Hydrographic assessment confirming minimum clearance between keel and seabed along planned passage meets safety criteria.
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Maneuvering
Browse Maneuvering terms for maritime professionals.
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अप्रोच दूरी मार्कर
Painted, lit, or electronic reference indicating remaining longitudinal distance to berth face during final approach.
View termआदेश विलंब प्रतिपूर्ति
Systematic adjustment made to navigation or machinery commands to account for time lag between order and vessel response, ensuring precise manoeuvring.
View termआपात् रुकावट दूरी
Measured distance travelled from full ahead to complete stop using maximum astern power and rudder amidships.
View termइंजन टेलीग्राफ अवरोध
A failure or obstruction in the engine telegraph system, preventing bridge orders from being transmitted to the engine room or vice versa.
View termइंजन लोड प्रतिक्रिया
The manner and speed at which the main engine adapts to sudden changes in power demand, crucial for manoeuvring and heavy weather operation.
View termइंटरएक्शन जोन चेतावनी
Advisory issued when proximity of shallow banks or passing vessels may cause hydrodynamic interaction affecting steering and under-keel clearance.
View termइलेक्ट्रॉनिक डॉकिंग एड
Shore-based microwave or laser sensor system providing real-time range, closing speed, and alignment data to approaching vessel.
View termएंकरिंग स्पीड रिडक्शन
Deliberate decrease in vessel speed to a safe limit before anchor deployment, minimizing anchor dragging and ensuring proper holding.
View termएज़िमुथ थ्रस्टर लॉक
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 termएडवांस दूरी गणना
Determination of the longitudinal distance the vessel travels on the original heading during a turn from rudder order until reaching new course.
View termएप्रोच ट्रैक सत्यापन
Confirmation that vessel’s intended approach line aligns with planned track and pilot’s instructions before final manoeuvring.
View termकंट्रोल सरफेस एकीकरण
The coordinated operation of rudders, stabilisers, and other movable surfaces to achieve optimal vessel steering and stability.
View termकुशन प्रभाव का आकलन
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 termकैप्स्टन पुल क्षमता
Maximum continuous line-pull that a deck capstan can exert when hauling mooring lines at rated speed.
View termक्रमिक पावर बर्स्ट
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 termक्विक स्टॉप मनोव्वर
Emergency procedure whereby engine is set full astern and helm hard over to rapidly stop vessel’s forward motion within minimum distance.
View termग्लाइड पाथ नियंत्रण
Continuous monitoring and adjustment of a vessel’s approach trajectory to the berth, ensuring a smooth, controlled entry under varying environmental forces.
View termचिपचिपा प्रवाह घर्षण
The resistance experienced by a vessel as it moves through water due to the fluid’s internal friction, affecting speed and fuel efficiency.
View termचैनल पार धारा
Lateral water flow across a dredged channel causing set and drift that must be compensated during navigation.
View termजड़ता नियंत्रण रणनीति
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 termजल गहराई अलार्म
An alert activated when the measured depth beneath a vessel approaches a pre-set minimum, used to avoid grounding.
View termजल घनत्व प्रतिपूर्ति
The adjustment made to vessel loading or draught calculations to account for local water density, affecting buoyancy and safe draft.
View termजॉयस्टिक संचालन मोड
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 termटग लाइन तनाव
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 termटग लीड चेंज
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 termटग सहायता अनुरोध
Formal VHF or written message from vessel or pilot to harbour authority asking for specified tug support for manoeuvring.
View termटर्न रेट पूर्वानुमानक
ECDIS or radar-derived graphic that projects vessel’s future position based on present speed and rate of turn settings.
View termटर्निंग बायस करेक्शन
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 termटैक्टिकल डायमीटर मूल्यांकन
Assessment of the vessel’s maximum transverse distance travelled during a turning circle with constant rudder angle at full speed.
View termटॉर्शनल शाफ्ट कंपन
Oscillation in the propulsion shaft caused by variations in torque, potentially leading to machinery damage if not controlled.
View termडायनामिक पोजिशनिंग होल्ड
A control mode where a vessel maintains its heading and position automatically using thrusters and propellers, essential for offshore operations and station keeping.
View termडेविट क्लीयरेंस सत्यापन
Process of ensuring the davit’s operational path is free of obstruction and ready for safe lifeboat launching or recovery.
View termडॉकिंग रैंप ढाल
The measured incline of a docking ramp, influencing the safe entry, exit, and support of a vessel during docking or undocking.
View termड्रिफ्ट एंगल अलार्म
Navigation sensor alert triggered when vessel’s leeway or sideslip exceeds predefined safe threshold relative to track.
View termतेज हवा में बर्थिंग
A berthing operation performed in high wind conditions, requiring specific techniques, increased tug assistance, or thruster use to maintain control and safety.
View termथ्रस्ट आवंटन मॉडल
A computational approach for optimally distributing propulsion thrust among multiple thrusters to achieve desired vessel motion and heading.
View termथ्रस्टर दक्षता गुणांक
A calculated ratio indicating how effectively a vessel’s thruster converts power input into thrust for manoeuvring operations.
View termथ्रस्टर रन अप
A procedure where thrusters are gradually powered up and tested before being engaged for manoeuvring or station keeping.
View termथ्रस्टर रन डाउन
The process of safely reducing thruster power and shutting down the units after manoeuvring or while leaving station keeping mode.
View termध्वनिक डॉप्लर माप
A navigational process using Doppler sonar to measure vessel speed and direction relative to water, crucial for precise manoeuvring and dynamic positioning.
View termनियंत्रित बहाव कोण
Intentional small leeway angle set between vessel heading and track to counter cross-wind or current during approach.
View termपार्श्व प्रोपेलर प्रभाव
Side-force generated by propeller rotation causing yaw, especially stern kick to port or starboard when powering ahead or astern.
View termपिचिंग मोमेंट नियंत्रण
The regulation of longitudinal pitching moments of a vessel, using ballast or thrusters, to ensure stability and reduce motion in varying sea states.
View termपिवट बिंदु अनुमान
Calculation of the vessel’s instantaneous longitudinal pivot point to predict turn characteristics in low-speed manoeuvring.
View termपोज़िशन फिक्स रद्द
Command to discontinue planned position fixing process when results are unreliable or time-critical manoeuvre takes priority.
View termप्रोपेलर गार्ड जांच
Inspection of the propeller guard for integrity and correct positioning before manoeuvring or departure, ensuring safe protection against entanglement or damage.
View termप्रोपेलर पिच समकालकता
Matching of pitch angles on controllable-pitch propellers to balance thrust and avoid yaw during twin-screw operations.
View termप्रोपेलर वॉक मूल्यांकन
Evaluation of sideways movement (walk) caused by propeller rotation while making headway or sternway at low speed.
View termफेंडर ऊर्जा अवशोषण
Capacity of berth fender system to absorb kinetic energy of vessel at specified berthing velocity without exceeding design deflection.
View termफेंडर पैनल संपर्क
The point or process where the vessel's hull makes contact with the berth fender panel, usually monitored to avoid structural damage.
View termबर्थ उपयुक्तता जांच
A verification process to ensure the selected berth meets vessel requirements in terms of depth, length, fendering, and operational limits before mooring.
View termबर्थ संरेखण लाइट्स
Pair or range of fixed shore lights that provide visual guidance to vessels for centreline alignment during final approach to berth.
View termबर्थिंग ऊर्जा सीमा
The total kinetic energy allowed for a vessel to safely berth, accounting for mass, speed, and fender capacity to prevent damage.
View termबर्थिंग वेग सीमा
Maximum allowable approach speed normal to berth to prevent fender overload and structural damage.
View termबैकिंग पावर रिज़र्व
Remaining astern propulsion capacity beyond that required for standard manoeuvre, ensuring additional stopping margin.
View termबो थ्रस्टर प्रयोग
Use of bow thruster to generate lateral force at bow for precise positioning or counteracting environmental forces during manoeuvring.
View termबो मोमेंट गुणांक
A calculated factor describing the turning moment generated by the bow, crucial for assessing vessel manoeuvrability during pilotage and berthing operations.
View termबोलार्ड पुल सत्यापन
Confirmation that a tug’s certified bollard-pull matches terminal requirements before allocating towage tasks.
View termब्रिज विंग क्लियरेंस
Minimum air gap required between ship’s bridge wing extremities and shore structures or lock walls during manoeuvring.
View termमूरिंग तनाव निगरानी
Real-time supervision of static and dynamic loads on mooring lines to maintain safe tension limits under environmental forces.
View termमोशन रेफरेंस यूनिट
A device that detects and reports a vessel’s six degrees of motion, used to support dynamic positioning and other navigational systems.
View termयॉ मोमेंट क्षतिपूर्ति
Adjustment of rudder angle, thruster output, or tug forces to counteract undesired yawing moments during low-speed manoeuvres.
View termरडर कोण सीमक
Device or setting restricting maximum rudder angle to prevent over-steer at speed or protect steering gear.
View termरडर प्रभावशीलता हानि
Reduction in steering response due to low water flow over rudder, cavitation, or mechanical limitation.
View termरिवर्स थ्रस्ट किक
A short, controlled burst of astern propulsion to quickly reduce a vessel’s forward speed or stop movement during precise manoeuvring.
View termरिवर्सिंग मोमेंटम जाँच
Verification manoeuvre carried out to ensure the vessel’s astern power can promptly overcome residual forward momentum before final approach or emergency stop.
View termरिवर्सिंग मोमेंटम जांच
Verification that astern power has arrested forward momentum before changing engine orders during docking sequence.
View termरेट स्थिरीकरण मोड
Autopilot setting that dampens oscillations by keeping rate of turn constant once a target value is reached during manoeuvre.
View termरोल अवधि का अनुमान
An evaluation of the time taken for a vessel to complete one full roll oscillation, essential for stability analysis and safe loading.
View termलीड एंगल सुधार
Adjustment applied to ship’s heading to offset predicted set and drift so that actual track leads planned approach line.
View termलेज़र डॉकिंग सिस्टम
High-precision laser array projecting range and angular deviation data to vessel displays for centimetre-level berthing accuracy.
View termवाटरजेट रिवर्सल थ्रस्ट
A manoeuvring action where the direction of waterjet propulsion is reversed, providing astern thrust for stopping or moving the vessel backwards.
View termविंच ब्रेक होल्डिंग क्षमता
Certified static load that a mooring-winch brake can safely withstand without paying out when lines are under tension.
View termशीयर ऑफ कंट्रोल
Active steering or thruster management to prevent a vessel from swinging away (sheering off) from its intended track or berth during approach.
View termशून्य गति पकड़
A function in vessel control systems where speed is automatically kept at zero, holding position against wind, current, and drift, without anchoring.
View termसक्शन प्रभाव का आकलन
The assessment of negative pressure that draws a vessel toward another object or structure during close-quarter manoeuvring, affecting control and safety.
View termसर्ज मोशन नियंत्रण
Management of longitudinal oscillations of vessel while moored, using winch tension adjustments or tug assistance to prevent contact damage.
View termसाइडफोर्स मुआवजा योजना
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 termसाइडस्लिप कोण निगरानी
Continuous observation of vessel’s lateral drift angle relative to track to ensure safe approach trajectory during docking.
View termसीपीपी पिच नेगेटिव
A controllable pitch propeller blade setting that provides astern thrust for stopping or reversing the vessel.
View termसीपीपी पिच पॉजिटिव
A controllable pitch propeller blade setting that provides forward thrust, the amount adjusted for desired vessel speed and power.
View termसीपीपी पिच शून्य
The position of a controllable pitch propeller (CPP) where the blades are aligned to produce no thrust, used for stopping or neutral operation.
View termस्टर्नवे स्पीड अलार्म
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 termस्टीयरिंग फीडबैक लूप
A control system that continually monitors rudder position and vessel heading to automatically correct steering and maintain set course.
View termस्लिप गणना मोड
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 termस्लिपवे अप्रोच ट्रैक
The planned or observed vessel path when aligning for entry onto a slipway, critical for safe launching or hauling operations.
View termहाइड्रोस्टैटिक ट्रिम बदलाव
Change in a vessel’s longitudinal trim resulting from variations in hydrostatic forces due to ballast, cargo, or water density changes.
View termहेडिंग रेट नियंत्रण
Autopilot or manual feedback setting that governs how rapidly the vessel’s heading may change, expressed in degrees per minute.
View termहेल्म सिंक्रनाइज़ेशन अलार्म
An alert indicating a mismatch between helm (steering wheel) position and rudder angle, requiring immediate attention to prevent loss of steering control.
View term