ETA修正
Notification that a vessel’s previously declared estimated time of arrival has changed and updated information is provided.
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External Communication
Browse External Communication terms for maritime professionals.
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ETA確認済み
Formal confirmation that a vessel’s estimated time of arrival is correct and accepted by both reporting vessel and authority.
View termMayday Relay
A distress message transmitted by a vessel or station on behalf of another vessel, aircraft, or person in grave and imminent danger when the original station is unable to send it.
View termPan Pan
A radiotelephony urgency signal indicating a situation urgent but not immediately life-threatening; always spoken in English.
View termアンカー流れ
Situation where a vessel’s anchor fails to hold and the vessel moves from its intended position, risking collision or grounding.
View termエスコート船
A vessel assigned to accompany another ship for navigational assistance, safety, security, or regulatory compliance in ports, coastal, or hazardous waters.
View termガードチャンネル
A designated VHF radio frequency used for emergency, distress, or mandatory communication monitoring.
View termクアドラント捜索
A systematic search pattern, typically used in SAR operations, covering four quadrants from a datum point to locate persons or objects.
View termクリアランスなし
Notification that the vessel does not have authorization or permission to enter, leave, or transit a specific area, port, or anchorage.
View termジャイロ不安定
A warning that the vessel’s gyrocompass cannot be trusted for accurate heading information.
View termスクリューに異物
A condition where the propeller is entangled with ropes, nets, or debris, affecting maneuverability.
View termチャンネル16
The international VHF radio distress, safety, and calling channel (156.8 MHz) monitored at all times by ships and shore stations.
View termチャンネル16
The international VHF radio distress, safety, and calling frequency (156.8 MHz) mandatory for all seagoing vessels to monitor continuously.
View termチャンネルを変えてください
Instruction to switch VHF radio communications from one designated channel to another for operational or traffic management reasons.
View termチャンネル混雑
Notification that the selected VHF working channel is congested with traffic, making immediate communication difficult.
View termパイロットに通知
Request for instructions, information, or confirmation from the maritime pilot regarding navigation or maneuvers.
View termパイロット乗船
Designated process and location where a maritime pilot embarks or disembarks from a vessel.
View termブリッジ待機中
Notification that the navigating bridge watch is monitoring the working channel and ready to respond immediately.
View termヘリコプター移乗
Operation involving the embarkation or disembarkation of personnel or cargo by helicopter to or from a vessel, requiring special procedures and communications.
View termメッセージ取消
Official notification that a previously transmitted message or warning is no longer valid or has been withdrawn.
View termメッセージ受信
Formal confirmation of receipt of a transmitted communication, usually by repeating essential content.
View termローカル交通
Vessels operating within a port, harbour, or defined coastal area, often with priority rules or reporting obligations for navigation safety.
View term乗船人数
Total count of persons (crew and passengers) on board, often requested for safety or SAR purposes.
View term交通状況を通知
Request for current information about vessel traffic, movement, or congestion in a specific area.
View term人落水
Emergency indicating that a person has fallen from a vessel into the water and immediate rescue actions are required.
View term位置を確認
Instruction or request to verify the vessel's current navigational position using all available means, including GPS, radar, and visual bearings, to ensure safe passage.
View term位置を確認してください
Instruction to confirm that a vessel’s reported navigational position has been received and understood.
View term位置不確か
Phrase used to indicate that the vessel's current navigational position cannot be reliably confirmed and may be inaccurate, requiring urgent verification.
View term位置確認
Request or instruction to verify and report the current location of a vessel, typically in latitude and longitude.
View term位置通過
Notification that a vessel has just crossed or gone abeam of a specified position, buoy, or waypoint.
View term作業完了
Notification that a particular port, cargo, or navigational operation has been fully finished.
View term係留作業
All procedures related to securing or unmooring a vessel to or from a berth, buoy, or anchorage.
View term係留索取扱い
The operation of preparing, passing, securing, and tending mooring lines to assist in berthing or unberthing a vessel.
View term入港中
Statement or report that a vessel is moving towards a port or entering a specific area.
View term全ステーション
Universal radio call addressing every vessel or station within radio range, especially for navigational warnings or urgent messages.
View term公衆通信
Telecommunications service on board for the exchange of messages between ship and shore for public or commercial use.
View term到着予定変わらず
Confirmation that the vessel’s estimated time of arrival remains as previously reported.
View term到着予定時刻確認済み
Affirmation that the vessel's estimated time of arrival at a specific point has been checked and is accurate based on current speed and conditions.
View term危険区域
A specified maritime zone where navigation is hazardous due to military exercises, wrecks, shallow waters, or other dangers requiring special attention or restricted entry.
View term危険区域
A specific zone designated as hazardous to navigation due to wrecks, shoals, operations, or other maritime risks; mariners are instructed to avoid entry.
View term危険貨物
Any substance or material that poses a significant risk to health, safety, or property during transport by sea, as defined by IMDG Code.
View term妨害検知
Notification that radio communication is being interfered with by intentional or unintentional signal jamming.
View term安全放送
Official VHF or NAVTEX message to all ships concerning safety-related information or urgent warnings.
View term射撃訓練
Planned military or naval operations in which weapons are fired in designated sea areas, usually requiring ships to keep clear.
View term座標確認済み
Affirmation that the provided position or waypoint coordinates are checked and verified as correct, usually before reporting to VTS or executing a navigational order.
View term座礁リスク
Potential danger of the vessel running aground due to shallow water or navigational error.
View term引き続き傾聴
Instruction to keep monitoring a specified VHF radio channel or other communication line for further traffic or safety messages.
View term引き続き聴取
Instruction to maintain a listening watch on a specified VHF channel for further communication or safety messages.
View term後進する
Order or report indicating the vessel is moving, or must move, backward relative to its heading.
View term必要喫水
Request or statement of the minimum water depth needed for safe passage of a vessel based on its loaded draft.
View term応答なし
Phrase used to indicate that a called station has not replied within a reasonable time, requiring repeat or escalation of the call as per radio protocols.
View term情報放送
A general transmission on VHF or NAVTEX to inform vessels about safety, weather, traffic or other operational matters.
View term意図を知らせてください
Request for a vessel to state its planned manoeuvre, course, or operational actions to aid traffic coordination.
View term接近禁止
Instruction to remain at a safe distance from a specified vessel, area, or hazard.
View term推進力喪失
Loss of ability to propel the vessel due to engine failure or other mechanical issues.
View term損傷を報告
Instruction to inform relevant authorities or stations of any structural, mechanical, or environmental damage sustained, with details for emergency response or investigation.
View term救命艇訓練
Regular training exercises involving the launching and operation of lifeboats as per SOLAS requirements.
View term方位を確認
Instruction to verify and report the direction of an object or navigational aid from the vessel, usually in degrees relative to the ship's heading or true north.
View term機関故障
A condition in which a vessel’s propulsion machinery is malfunctioning or unreliable, possibly affecting speed and manoeuvrability.
View term正確性を確認
Instruction to verify the accuracy of a reported position, course, message, or navigational information before proceeding or acknowledging receipt.
View term気象通報
Official broadcast of weather conditions, warnings, and forecasts relevant to maritime navigation.
View term水路に進入してください
Instruction to enter and follow a designated fairway or channel for safe navigation as directed by VTS or port authority.
View term水路占有中
Notification that a fairway or navigation channel is temporarily blocked or being used by another vessel, requiring others to wait or take alternate route.
View term油による汚染
Presence or discharge of oil into marine waters from a vessel or facility, constituting a reportable incident and requiring emergency action as per MARPOL and local rules.
View term沿岸局
A shore-based VHF or radio station responsible for maritime safety and communication in a designated coastal area.
View term混雑した交通
A situation or area where a high density of vessels requires heightened vigilance, reduced speed, and strict adherence to COLREGS and local traffic rules.
View term港内交通
Collective term for the movement of vessels and craft within port limits as monitored by VTS or Harbour Master.
View term火災を報告
A prompt or instruction to immediately communicate the occurrence, location, and extent of a fire on board or ashore, using standard emergency procedures.
View term灯火のないブイ
A navigation buoy whose light is inoperative or not functioning, presenting a hazard at night.
View term無線沈黙
A formal order requiring all stations to cease transmitting on a frequency, usually for distress or security reasons.
View term現位置保持
Instruction to maintain current position, either at anchor or underway, until further orders are received.
View term現場に到着
Statement indicating that the vessel, aircraft, or rescue unit has arrived at the position of an incident or casualty.
View term磁気干渉
Disruption or deviation of magnetic compass readings due to local magnetic fields, ship’s structure, or electrical equipment, requiring verification and correction.
View term緊急位置
Location reported by a vessel or person in distress, usually in latitude and longitude for rescue coordination.
View term緊急通信
Radio messages of high urgency concerning the safety of a ship, person, or environment, requiring priority over all other communications except distress.
View term聴取監視
Continuous monitoring of a designated VHF or MF/HF radio channel for traffic, safety, or distress messages, as required by IMO and ITU regulations.
View term聴守
Continuous monitoring of a specified VHF or radio frequency for traffic, safety, or distress calls.
View term航行を再開してください
Order authorising a vessel to continue its original voyage after a temporary stop, alteration, or holding pattern.
View term航行警告
A formal broadcast or message informing mariners of navigational hazards, new obstructions, or significant changes in channels, aids to navigation, or regulations.
View term航行警報
Official broadcast of hazards, obstructions, or operational restrictions that may affect safe navigation.
View term船団に参加
Instruction or request for a vessel to assemble and proceed as part of an organized convoy for mutual safety, security, or navigation, under VTS or naval coordination.
View term衝突リスク
Phrase indicating that two or more vessels are on courses or at speeds that may result in collision unless action is taken according to COLREGS.
View term警報取消
Official notification that a previously issued warning is no longer in effect.
View term警報放送
A formal message disseminated by VTS, harbour authority, or vessels to alert all ships in an area about navigational hazards, operations, or urgent situations.
View term警報解除
Formal message to withdraw or annul a previously issued navigational, meteorological, or safety warning that is no longer in effect.
View term距離を確認
Instruction or query to verify the distance to a navigational object, other vessel, or danger, often using radar or visual bearings.
View term追い越す意図あり
Announcement that a vessel plans to pass another vessel ahead on a specified side in accordance with the COLREGS.
View term追従船舶
A vessel which is navigating behind another in the same direction, often in a convoy or traffic lane.
View term通信テスト
A check of the operational status and clarity of shipboard, shore, or VTS radio equipment by transmitting test calls and receiving acknowledgments.
View term速力を上げてください
Instruction to make more way through the water to meet traffic, tidal, or berth scheduling requirements.
View term進路を確認してください
A request or instruction to verify and state the vessel’s current or intended navigational course, usually in degrees true or magnetic, for navigational safety.
View term進路変更なし
Statement indicating that the vessel’s heading remains as previously instructed or reported.
View term道を譲ってください
An instruction for a vessel to yield in order to avoid collision and allow another vessel to pass as per the COLREGS.
View term遭難信号受信
Formal confirmation of receipt of a distress message, typically using prescribed wording as per SMCP and ITU RR.
View term遭難解除
Official transmission that a previous distress message is no longer valid, usually after the situation has been resolved.
View term遭難通信
Radio transmissions exclusively concerning vessels or persons in grave and imminent danger, given absolute priority on all frequencies as per ITU and SOLAS regulations.
View term針路を変えてください
Instruction to change the vessel’s current heading in order to avoid danger or comply with traffic management.
View term針路変更なし
A statement or confirmation that a vessel’s present heading will not be altered.
View term錨がずれる
Situation where a vessel’s anchor does not hold, causing the ship to drift from its intended position.
View term障害物報告済み
Notification that a hazard, such as a floating object or wreck, is present and may endanger navigation.
View term障害物報告済み
Notification that a physical hazard, such as a wreck, buoy, or floating object, has been observed in a navigable area, requiring mariners to exercise caution.
View term離れてください
Instruction to maintain a safe distance from a specified vessel, area, or hazard to prevent collision, obstruction, or risk during navigation or operations.
View term頻繁な混信
Repeated radio noise or overlapping transmissions that degrade VHF communication quality on the working channel.
View term高電圧
Warning regarding electrical systems or cables carrying dangerous voltage levels, requiring safety precautions.
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