Safety

Not Under Command

Also known as: NUC

Definition

A vessel unable to manoeuvre as the rules require through some exceptional circumstance, such as a steering failure. Shows two all-round red lights or two black balls.

See it in practice

Rule 18: Responsibilities between vessels
Rule 27: Vessels not under command or restricted in their ability to manoeuvre

More Safety terms

EPIRB Flare Grab Bag Lifejacket Man Overboard (MOB)Mayday PAN-PAN Securite VHF Radio Restricted in Ability to Manoeuvre Constrained by Draught

Where Not Under Command comes up in the course

Free theory lessons that use this term in context.

Competent CrewCOLREGS Introduction
Yachtmaster OffshoreCOLREGs for the Yachtmaster
Day SkipperCOLREGS Rules and Lights
Coastal SkipperCOLREGs, Traffic Separation and Restricted Visibility