CPPネガティブピッチ
A controllable pitch propeller blade setting that provides astern thrust for stopping or reversing the vessel.
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Maneuvering
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CPPピッチゼロ
The position of a controllable pitch propeller (CPP) where the blades are aligned to produce no thrust, used for stopping or neutral operation.
View termCPPポジティブピッチ
A controllable pitch propeller blade setting that provides forward thrust, the amount adjusted for desired vessel speed and power.
View termねじり軸振動
Oscillation in the propulsion shaft caused by variations in torque, potentially leading to machinery damage if not controlled.
View termアジマススラスター・ロック
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 termアドバンス距離計算
Determination of the longitudinal distance the vessel travels on the original heading during a turn from rudder order until reaching new course.
View termアプローチトラック検証
Confirmation that vessel’s intended approach line aligns with planned track and pilot’s instructions before final manoeuvring.
View termアプローチ距離マーカー
Painted, lit, or electronic reference indicating remaining longitudinal distance to berth face during final approach.
View termアンカー速度減速
Deliberate decrease in vessel speed to a safe limit before anchor deployment, minimizing anchor dragging and ensuring proper holding.
View termアンダーキール余裕調査
Hydrographic assessment confirming minimum clearance between keel and seabed along planned passage meets safety criteria.
View termウインチブレーキ保持力
Certified static load that a mooring-winch brake can safely withstand without paying out when lines are under tension.
View termウォータージェット逆推力
A manoeuvring action where the direction of waterjet propulsion is reversed, providing astern thrust for stopping or moving the vessel backwards.
View termエンジンテレグラフ障害
A failure or obstruction in the engine telegraph system, preventing bridge orders from being transmitted to the engine room or vice versa.
View termエンジン負荷応答
The manner and speed at which the main engine adapts to sudden changes in power demand, crucial for manoeuvring and heavy weather operation.
View termキャプスタン引張能力
Maximum continuous line-pull that a deck capstan can exert when hauling mooring lines at rated speed.
View termクイックストップ操船
Emergency procedure whereby engine is set full astern and helm hard over to rapidly stop vessel’s forward motion within minimum distance.
View termクッション効果推定
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 termグライドパス制御
Continuous monitoring and adjustment of a vessel’s approach trajectory to the berth, ensuring a smooth, controlled entry under varying environmental forces.
View termサイドスリップ角監視
Continuous observation of vessel’s lateral drift angle relative to track to ensure safe approach trajectory during docking.
View termサクション効果推定
The assessment of negative pressure that draws a vessel toward another object or structure during close-quarter manoeuvring, affecting control and safety.
View termサージモーション制御
Management of longitudinal oscillations of vessel while moored, using winch tension adjustments or tug assistance to prevent contact damage.
View termジョイスティック操船モード
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 termスターンウェイスピードアラーム
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 termスラスターランダウン
The process of safely reducing thruster power and shutting down the units after manoeuvring or while leaving station keeping mode.
View termスラスターランナップ
A procedure where thrusters are gradually powered up and tested before being engaged for manoeuvring or station keeping.
View termスラスター効率係数
A calculated ratio indicating how effectively a vessel’s thruster converts power input into thrust for manoeuvring operations.
View termスリップウェイ進入コース
The planned or observed vessel path when aligning for entry onto a slipway, critical for safe launching or hauling operations.
View termスリップ計算モード
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 termゼロスピードホールド
A function in vessel control systems where speed is automatically kept at zero, holding position against wind, current, and drift, without anchoring.
View termタグボート支援要請
Formal VHF or written message from vessel or pilot to harbour authority asking for specified tug support for manoeuvring.
View termタグライン張力
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 termタグリードチェンジ
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 termターンレート予測計
ECDIS or radar-derived graphic that projects vessel’s future position based on present speed and rate of turn settings.
View termダビットクリアランス確認
Process of ensuring the davit’s operational path is free of obstruction and ready for safe lifeboat launching or recovery.
View termドッキングランプ勾配
The measured incline of a docking ramp, influencing the safe entry, exit, and support of a vessel during docking or undocking.
View termドリフト角アラーム
Navigation sensor alert triggered when vessel’s leeway or sideslip exceeds predefined safe threshold relative to track.
View termバウスラスター使用
Use of bow thruster to generate lateral force at bow for precise positioning or counteracting environmental forces during manoeuvring.
View termバウモーメント係数
A calculated factor describing the turning moment generated by the bow, crucial for assessing vessel manoeuvrability during pilotage and berthing operations.
View termバースアラインメント灯
Pair or range of fixed shore lights that provide visual guidance to vessels for centreline alignment during final approach to berth.
View termバース適合性チェック
A verification process to ensure the selected berth meets vessel requirements in terms of depth, length, fendering, and operational limits before mooring.
View termピッチングモーメント制御
The regulation of longitudinal pitching moments of a vessel, using ballast or thrusters, to ensure stability and reduce motion in varying sea states.
View termフェンダーエネルギー吸収
Capacity of berth fender system to absorb kinetic energy of vessel at specified berthing velocity without exceeding design deflection.
View termフェンダーパネル接触
The point or process where the vessel's hull makes contact with the berth fender panel, usually monitored to avoid structural damage.
View termブリッジウイングクリアランス
Minimum air gap required between ship’s bridge wing extremities and shore structures or lock walls during manoeuvring.
View termプロペラウォーク評価
Evaluation of sideways movement (walk) caused by propeller rotation while making headway or sternway at low speed.
View termプロペラガード点検
Inspection of the propeller guard for integrity and correct positioning before manoeuvring or departure, ensuring safe protection against entanglement or damage.
View termプロペラピッチ同期
Matching of pitch angles on controllable-pitch propellers to balance thrust and avoid yaw during twin-screw operations.
View termヘディングレート制御
Autopilot or manual feedback setting that governs how rapidly the vessel’s heading may change, expressed in degrees per minute.
View termボラードプル確認
Confirmation that a tug’s certified bollard-pull matches terminal requirements before allocating towage tasks.
View termヨーモーメント補正
Adjustment of rudder angle, thruster output, or tug forces to counteract undesired yawing moments during low-speed manoeuvres.
View termリード角補正
Adjustment applied to ship’s heading to offset predicted set and drift so that actual track leads planned approach line.
View termレーザードッキングシステム
High-precision laser array projecting range and angular deviation data to vessel displays for centimetre-level berthing accuracy.
View termレート安定化モード
Autopilot setting that dampens oscillations by keeping rate of turn constant once a target value is reached during manoeuvre.
View term位置決定中止
Command to discontinue planned position fixing process when results are unreliable or time-critical manoeuvre takes priority.
View term係留張力監視
Real-time supervision of static and dynamic loads on mooring lines to maintain safe tension limits under environmental forces.
View term制御されたドリフト角
Intentional small leeway angle set between vessel heading and track to counter cross-wind or current during approach.
View term動作基準ユニット
A device that detects and reports a vessel’s six degrees of motion, used to support dynamic positioning and other navigational systems.
View term動的ポジショニング保持
A control mode where a vessel maintains its heading and position automatically using thrusters and propellers, essential for offshore operations and station keeping.
View term反動慣性確認
Verification that astern power has arrested forward momentum before changing engine orders during docking sequence.
View term強風下の接岸
A berthing operation performed in high wind conditions, requiring specific techniques, increased tug assistance, or thruster use to maintain control and safety.
View term後進出力予備
Remaining astern propulsion capacity beyond that required for standard manoeuvre, ensuring additional stopping margin.
View term後進慣性確認
Verification manoeuvre carried out to ensure the vessel’s astern power can promptly overcome residual forward momentum before final approach or emergency stop.
View term慣性制御戦略
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 term戦術旋回径評価
Assessment of the vessel’s maximum transverse distance travelled during a turning circle with constant rudder angle at full speed.
View term指令遅延補正
Systematic adjustment made to navigation or machinery commands to account for time lag between order and vessel response, ensuring precise manoeuvring.
View term接岸エネルギー予算
The total kinetic energy allowed for a vessel to safely berth, accounting for mass, speed, and fender capacity to prevent damage.
View term推力配分モデル
A computational approach for optimally distributing propulsion thrust among multiple thrusters to achieve desired vessel motion and heading.
View term操舵フィードバックループ
A control system that continually monitors rudder position and vessel heading to automatically correct steering and maintain set course.
View term操舵面統合
The coordinated operation of rudders, stabilisers, and other movable surfaces to achieve optimal vessel steering and stability.
View term旋回バイアス補正
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 term旋回中心推定
Calculation of the vessel’s instantaneous longitudinal pivot point to predict turn characteristics in low-speed manoeuvring.
View term横力補正計画
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 term横揺れ周期推定
An evaluation of the time taken for a vessel to complete one full roll oscillation, essential for stability analysis and safe loading.
View term横方向プロペラ効果
Side-force generated by propeller rotation causing yaw, especially stern kick to port or starboard when powering ahead or astern.
View term横逸制御
Active steering or thruster management to prevent a vessel from swinging away (sheering off) from its intended track or berth during approach.
View term段階的パワーバースト
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 term水密度補正
The adjustment made to vessel loading or draught calculations to account for local water density, affecting buoyancy and safe draft.
View term水深警報
An alert activated when the measured depth beneath a vessel approaches a pre-set minimum, used to avoid grounding.
View term相互作用域警報
Advisory issued when proximity of shallow banks or passing vessels may cause hydrodynamic interaction affecting steering and under-keel clearance.
View term着岸速度制限
Maximum allowable approach speed normal to berth to prevent fender overload and structural damage.
View term粘性流体抵抗
The resistance experienced by a vessel as it moves through water due to the fluid’s internal friction, affecting speed and fuel efficiency.
View term緊急停止距離
Measured distance travelled from full ahead to complete stop using maximum astern power and rudder amidships.
View term航路横断流
Lateral water flow across a dredged channel causing set and drift that must be compensated during navigation.
View term舵シンクロアラーム
An alert indicating a mismatch between helm (steering wheel) position and rudder angle, requiring immediate attention to prevent loss of steering control.
View term舵効失損
Reduction in steering response due to low water flow over rudder, cavitation, or mechanical limitation.
View term舵角リミッター
Device or setting restricting maximum rudder angle to prevent over-steer at speed or protect steering gear.
View term逆推力キック
A short, controlled burst of astern propulsion to quickly reduce a vessel’s forward speed or stop movement during precise manoeuvring.
View term電子ドッキング支援装置
Shore-based microwave or laser sensor system providing real-time range, closing speed, and alignment data to approaching vessel.
View term静水トリムシフト
Change in a vessel’s longitudinal trim resulting from variations in hydrostatic forces due to ballast, cargo, or water density changes.
View term音響ドップラー測定
A navigational process using Doppler sonar to measure vessel speed and direction relative to water, crucial for precise manoeuvring and dynamic positioning.
View term