Pratique

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Q flag

Pratique is the license given to a ship to enter port on assurance from the captain to convince the authorities that she is free from contagious disease. The clearance granted is commonly referred to as Free Pratique. A ship can signal a request for "Pratique" by flying a solid yellow square-shaped flag. This yellow flag is the Q flag in the set of International maritime signal flags.[1]

Since flying the Q flag involves a request for boarding by Port State Control, it has also become an invitation to Customs to inspect a vessel for dutiable goods or contraband, as in the "Rich Harvest" case.[2]

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