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Browse Nav terms for maritime professionals.

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Adiante muito devagar

Engine telegraph order instructing propulsion at the lowest possible speed ahead, used for delicate manoeuvring or congested areas.

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Alarme de Início de Guarnição

An electronic or mechanical alarm that notifies the bridge team when it is time to initiate the wheel-over manoeuvre, usually at a pre-set waypoint or heading.

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Alarme de monitoramento de integridade

An alarm signaling a failure or inconsistency detected in the position integrity monitoring system, requiring immediate action.

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Alarme de sequenciamento de waypoints

An alarm on navigation systems indicating failure to automatically advance to the next waypoint as programmed in the voyage plan.

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Alinhamento da Linha Central do Canal

The practice of steering a vessel so that its longitudinal axis remains aligned with the designated navigational centreline of a fairway, as marked by buoys, lights, or electronic aids.

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Alinhamento de Faróis de Enfiamento

The navigation technique of steering a vessel so that two range lights, one behind the other, appear vertically aligned, indicating the vessel is on the safe channel axis.

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Alinhamento de Faróis Guia

The process of navigating a vessel by visually aligning two or more fixed leading lights (range lights), ensuring the vessel remains on the recommended channel course.

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Altura livre aérea

The vertical distance from the waterline to the highest point of the vessel, used to determine safe passage under bridges or overhead obstacles.

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Altura livre sob a ponte

The vertical distance between the lowest part of the bridge span and the highest point of the vessel, ensuring safe passage.

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Bacia de Manobra do Canal

A designated widened section of a navigational fairway, specifically constructed to allow vessels to safely turn or change direction under pilotage or tug assistance.

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Cabo de reboque de emergência

A strong wire or rope rigged at bow or stern, readily accessible for emergency towing if the vessel becomes disabled.

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Caderno de manobras da ponte

A logbook kept on the bridge for recording all manoeuvring orders, engine telegraph movements, helm commands, and critical events during a vessel's navigation and docking.

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Conexão de Rebocador de Escolta

The established secured line or method by which an escort tug is physically connected to a vessel, typically for controlling or assisting the ship during harbour or restricted water navigation.

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Conexão piloto ativa

An active data connection port on the bridge that provides real-time navigational data from the ship's ECDIS or AIS system for the pilot’s portable unit.

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Confirmação de âncora suspensa

The formal notification to the bridge or engine room that the anchor is clear of the seabed and ship is free to maneuver.

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Controle de recuo da âncora

The controlled paying out of anchor chain in reverse (walkback) under power, used for precise anchor positioning or retrieval.

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Correção do empuxo transversal

The adjustment applied to helm or engine orders to compensate for the sideways force exerted by a propeller, especially during astern or ahead movements.

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Corrigir a guinada

Helm order given to check the vessel’s swing and prevent further turning, typically after a large rudder movement.

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Cálculo da janela de maré

The process of determining the optimal period based on tidal height during which a vessel can safely transit shallow waters or cross a bar.

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Desembarque do prático do porto

The controlled process by which the harbour pilot safely leaves the vessel after completing the inbound or outbound passage.

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Deslocamento de Eco de Radar

The adjustment of the radar image to compensate for systematic error or offset, ensuring true target positions correspond to their charted locations and improving navigation accuracy.

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Distância livre a ré

The available unobstructed distance behind the vessel, critical for manoeuvring astern.

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Diâmetro do círculo de guinada

The distance perpendicular to the original track between tangents of the vessel’s path when executing a steady-turn at a given rudder angle and speed, usually expressed in ship lengths or cables.

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Efeito da área de vento

The influence of the ship’s exposed surface area above the waterline, causing increased drift or leeway under wind pressure.

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Efeito de almofada da margem

Hydrodynamic phenomenon where water pressure between a vessel and a nearby bank creates a cushion, pushing the bow away from the bank.

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Efeito de sucção da margem

Hydrodynamic phenomenon where a vessel navigating close to a bank experiences a suction force pulling the vessel toward the bank due to water velocity difference.

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Embarque do prático do porto

The procedure for safely boarding the harbour pilot at sea or at the entrance of the port using a pilot ladder or launch.

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Erro de desvio de rota

The perpendicular distance between a vessel's actual position and the planned track line, used for navigation accuracy.

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Erro do giroscópio

An inaccuracy or malfunction of the ship’s gyro compass, resulting in incorrect heading information displayed to bridge equipment.

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Escada de prático instalada

A pilot ladder correctly secured and deployed over the ship’s side, ready for safe boarding or disembarkation of the pilot as per SOLAS standards.

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Esquema de Separação de Tráfego

An internationally recognized routing measure that separates opposing streams of vessel traffic by defined lanes and rules to reduce collision risk in busy or restricted waters.

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Estimativa do ângulo de abatimento

The calculated or visually assessed angle between a vessel’s heading and actual course over ground, caused by wind or current.

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Exibição de carta vetorial

An electronic navigational chart presented in vector format, enabling interactive layers and detailed, scalable map features for navigation and route planning.

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Exibição de sobreposição de radar

The presentation of radar information directly on the electronic chart display, enabling visual correlation of radar targets with charted features.

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Faixa de Tráfego Recomendada

A charted route within a traffic separation scheme or recommended track designed for the safe passage of vessels, but not compulsory. Usage reduces collision risk.

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Falha de referência de rumo

A malfunction or loss of accuracy in the ship’s heading reference system, such as gyro or magnetic compass, affecting navigation and safe maneuvering.

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Fixação de posição por satélite

A position determined using satellite navigation signals, typically from systems like GPS or GLONASS, used for precise ship positioning.

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Fixação de posição terrestre

A position established by bearings or distances to known land features or aids to navigation, not using satellites.

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Folga sob a quilha

Vertical distance between the lowest point of a vessel’s keel and the seabed referenced to chart datum; the key safety margin preventing grounding.

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Gestão de recursos da ponte

The effective use and coordination of all available bridge resources—personnel, equipment, and information—to ensure safe navigation and vessel operation.

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Gravação de áudio da ponte

Continuous audio recording of all conversations and alarms on the bridge as mandated by SOLAS for investigation and safety compliance.

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Layout do display de comando

The arrangement of navigation and maneuvering information shown on the conning display for optimal bridge decision-making and situational awareness.

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Leme ao meio

Helm order to bring the rudder to the midships (zero angle) position, aligning with the vessel’s centerline.

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Limite de Velocidade no Porto

The officially published maximum speed permitted for vessels within a designated harbour or port area, set by local authorities to ensure safety of navigation and infrastructure.

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Linha de distância eletrônica

A digital tool on radar/ECDIS allowing navigators to set and measure a precise distance from own ship to a selected point or target.

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Linha de guinada

A track line shown on chart or radar which, when crossed, indicates the precise moment to start the wheel-over so that the intended new course is met accurately.

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Linha de marcação eletrônica

A digital navigational tool on ECDIS or radar for plotting and monitoring bearings to fixed or moving targets, improving situational awareness.

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Linha de índice paralelo

A radar-derived reference line drawn parallel to the vessel's intended track, used to monitor cross-track error by keeping a chosen land echo or seamark at a constant offset.

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Manual de Plotagem de Radar

A publication or onboard manual containing standardized instructions, techniques, and worksheets for manually plotting radar targets to assess collision risk and avoidance actions.

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Marca de água segura

IALA buoyage mark indicating there is navigable water all around the mark.

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Margem de calado dinâmico

An additional draught margin included to account for dynamic effects such as squat, trim, and vessel movement in shallow waters.

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Margem de efeito squat

The additional draught margin applied to account for the increased draught of a vessel due to the squat effect in shallow water.

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Monitoramento da integridade da posição

Continuous verification of the reliability and accuracy of the ship’s position as provided by navigation systems.

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Método de índice paralelo

A radar navigation technique in which fixed radar echoes are kept on predetermined parallel lines to verify the vessel remains on its planned track without constant position fixing.

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Pare as máquinas principais

Engine telegraph order to cease all propulsion; used when vessel is to remain stationary or fully secured at berth.

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Plano de alocação de rebocadores

A detailed arrangement indicating the number, type, and position of tugs assigned to assist a vessel during berthing, unberthing, or transit in restricted waters.

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Plano de passagem de praticagem

A detailed route plan, prepared jointly by the master and pilot, outlining intended track, waypoints, speed, and manoeuvres for the pilotage operation.

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Plotagem Automática de Radar

The process by which radar targets are tracked and collision risk assessed automatically by ARPA systems, displaying real-time information on target movements and CPA/TCPA.

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Ponto de alteração de rumo

A precisely charted position where a ship is required to change its course, usually as part of a passage plan.

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Ponto de guinada

The charted position at which the rudder is first applied to initiate a planned course alteration so that the vessel follows the intended turning track.

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Ponto de Relato VTS

A specifically designated geographical position where a vessel is required to contact and report to the Vessel Traffic Service (VTS) with position, status, and intentions.

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Posição de leme de emergência

A dedicated station—usually aft in the steering gear room—used to control the ship’s steering in the event of bridge steering failure.

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Posição Rebocador de Popa

The designated location of a tug at the stern of a vessel, used to provide pulling or braking force during manoeuvring, berthing, or unberthing operations.

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Posição Rebocador de Proa

The assigned and maintained location of a tug at the bow of a vessel to provide pushing, pulling, or steering assistance during berthing, unberthing, or manoeuvring in confined waters.

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Preparar máquinas principais

Order for main engines to be ready for immediate use, typically before departure, arrival, or manoeuvring.

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Procedimento de transferência do leme

The standardised method for transferring control of the ship’s steering from one helm station or operator to another, ensuring continuous and safe steering.

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Profundidade projetada do canal

The minimum depth of a navigational channel as determined and maintained by authorities for safe passage of vessels, referenced to chart datum.

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Reconhecimento da ordem do leme

The required verbal response by the helmsman to confirm receipt and understanding of a helm order from the officer of the watch.

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Reduza para cinco

Helm order instructing the helmsman to reduce rudder angle to five degrees while maintaining course adjustment.

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Reduza para um cabo

Order to reduce the number of mooring lines on each bollard to one, preparing the vessel for departure.

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Rota de Águas Profundas

A route within defined limits in deep water that is charted and designated for the passage of vessels requiring deep draught, providing safe clearance from underwater hazards.

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Rota efetuada

The actual path a vessel follows over the ground, as recorded by position fixes, often used interchangeably with course made good.

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Rumo efetuado

The actual path of a vessel over the ground, as determined by position fixes, regardless of set or drift.

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Ré muito devagar

Engine telegraph order instructing propulsion at the lowest possible speed astern, used for delicate reversing or while manoeuvring in tight spaces.

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Seta e deriva da corrente

The direction (set) and speed (drift) of water current affecting the ship’s course and position.

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Sino de avante devagar

The engine telegraph order for slow speed ahead, typically used during precise manoeuvring, docking, or when entering confined waters.

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Sino meia avante

Engine telegraph order instructing propulsion at half engine speed ahead, used for moderate manoeuvring or departure from berth.

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Sino toda avante

Engine telegraph order instructing propulsion at full engine speed ahead, typically used in open sea or to quickly gain speed.

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Sistema de Relato Obrigatório

A regulatory system requiring vessels to provide voyage information at specified locations or intervals, typically enforced by local or international authorities for traffic monitoring and safety.

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Sistema global de navegação

A satellite-based navigation system such as GPS, GLONASS, Galileo, or BeiDou, providing worldwide position, navigation, and timing services to vessels.

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Solte o cabo de estibordo

Mooring command to release or cast off the starboard (right) mooring line or cable.

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Solte todos os cabos

Final order to release all mooring lines, allowing the vessel to depart from berth.

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Tabela de avanço e transferência

A manoeuvring aid providing predicted advance (distance along original track) and transfer (lateral distance) for specific speeds and rudder angles to plan safe turns.

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Taxa de Guarnição

The speed at which a vessel changes its heading, typically measured in degrees per minute and displayed on the bridge instrument panel.

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Taxa de recolhimento da âncora

The speed at which the anchor cable is hauled in, usually measured in meters per minute, to control anchor recovery.

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Todo a bombordo

Helm order instructing the rudder to be put fully to port (left) for maximum turning effect.

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Todo a estibordo

Helm order instructing the rudder to be put fully to starboard (right) for maximum turning effect.

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Troca do equipamento de leme

The act of switching from one steering gear system or power unit to another, often for redundancy or in case of equipment failure.

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Troca mestre-prático

A formal communication process between the ship’s master and the pilot to share essential navigation information, plans, and local hazards before pilotage.

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Variação do compasso magnético

The angular difference between true north and magnetic north, affecting compass readings on board ships.

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Velocidade mínima de desencaixe

The lowest speed required to break the anchor free from the seabed and commence recovery.

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Velocidade mínima de governo

The lowest speed at which the vessel maintains effective steering control, typically specified by the vessel’s maneuvering data.

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Verificação da velocidade de manobra

The process of verifying and confirming the vessel’s speed through the water is suitable for safe manoeuvring during berthing, departure, or restricted navigation.

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Verifique a guinada

Helm or mooring order to observe and, if necessary, limit or arrest the vessel's swinging motion, especially when turning or anchoring.

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Vigia de navegação na ponte

A continuous period during which designated officers and crew maintain vigilance and operational control on the bridge to ensure the vessel’s safe navigation.

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Zona de Proibição de Ultrapassagem

A defined sector of a channel or waterway where overtaking by vessels is prohibited for safety reasons, often due to restricted width or high traffic density.

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Zona de Tráfego Costeiro

A coastal area, adjacent to the landward side of a traffic separation scheme, intended for use by vessels not using the main traffic lanes, such as local or smaller craft.

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Área de embarque do prático

A designated area, marked on charts, where the pilot boards or disembarks from a vessel, usually at port approaches or fairway entrances.

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Área de Precaução

A defined area where vessels must navigate with particular caution, often due to traffic convergence, hazards, or complex navigation conditions. Special rules or recommendations may apply.

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