[little jeremiah]

What does “not under command” signify?

[Porkchop]

***What does “not under command” signify?

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From the NAVRULES (Mariner’s “Rules of the Road”)

Rule 3
f. The term “vessel not under command” means a vessel which through some exceptional circumstance is unable to maneuver as required by these Rules and is therefore unable to keep out of the way of another vessel.

https://www.navcen.uscg.gov/pdf/navrules/navrules.pdf
(pages 6 & 7 - the Rule is the same for both Inland and International waters)