What is Underkeel Clearance?
Underkeel Clearance Vertical distance between the lowest point of a vessel’s keel and the seabed referenced to chart datum; the key safety margin preventing grounding.
Source: IMO SMCP, STCW Convention, SOLAS, COLREG
How is “Underkeel Clearance” Used in Practice?
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.
Certification Exam Relevance
Who Needs to Know This Term?
- Deck Officers
- Engine Officers
- Masters
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What is Underkeel Clearance?
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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