Q Flag (Quarantine Flag)

A solid yellow flag historically used to indicate a vessel must clear customs/health inspections; in modern recreational boating, rarely used except in certain international entries.

Related Terms

Navigation Rules

The “rules of the road” for waterways, dictating right-of-way, overtaking procedures, and collisi...

Inland vs. International Rules

Inland rules apply in many U.S. domestic waters, while international rules govern seaward of spec...

Collision Avoidance

Strategies to prevent accidents, including early course changes, clear signals, and adherence to ...

Federal Regulations

Boating rules set by the US Coast Guard or other federal entities (e.g., EPA for marine pollution...

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