Nav
Vertical distance between the lowest point of a vessel’s keel and the seabed referenced to chart datum; the key safety margin preventing grounding.
Quick answer: Vertical distance between the lowest point of a vessel’s keel and the seabed referenced to chart datum; the key safety margin preventing grounding.
This term page is part of the Protermify Maritime glossary and is published as static HTML for fast indexing and clear language coverage.
Vertical distance between the lowest point of a vessel’s keel and the seabed referenced to chart datum; the key safety margin preventing grounding.
龙骨下余隙 matters because it supports clear communication in Nav contexts for Deck Officers, Engine Officers, and Masters. It also connects to aviation training and exam language such as STCW, Marlins Test, ISF Watchkeeper, and GMDSS.
This page is rendered as static HTML from source-backed terminology data so search engines and AI systems can parse the content without client-side code.
Questions and answers
In this glossary, 龙骨下余隙 refers to: Vertical distance between the lowest point of a vessel’s keel and the seabed referenced to chart datum; the key safety margin preventing grounding.
In maritime communication, this term appears in contexts such as: "港口控制呼叫 MV Aurora：您目前的龙骨下余隙为一點二米（以海图基准计）；请减速以减少掠沉并报告意图。"
龙骨下余隙 matters because it supports clear communication in Nav contexts for Deck Officers, Engine Officers, and Masters. It also connects to aviation training and exam language such as STCW, Marlins Test, ISF Watchkeeper, and GMDSS.
龙骨下余隙 is mainly used by Deck Officers, Engine Officers, and Masters.
In this glossary, 龙骨下余隙 is grouped under Nav. Related pages in this category explain adjacent procedures, commands and operational concepts.
This definition is sourced from IMO SMCP, STCW Convention, SOLAS, COLREG and published by Protermify Maritime as a static maritime reference page.
Vertical distance between the lowest point of a vessel’s keel and the seabed referenced to chart datum; the key safety margin preventing grounding.
Harbour Control to MV Aurora, your underkeel clearance is now one decimal two metres at chart datum; adjust speed to minimise squat and confirm intentions.
龙骨下余隙
港口控制呼叫 MV Aurora：您目前的龙骨下余隙为一點二米（以海图基准计）；请减速以减少掠沉并报告意图。
English reference definition
IMO SMCP, STCW Convention, SOLAS, COLREG
Use the related links below to continue through connected maritime terminology.
