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Plain yellow: my vessel is healthy and I request free pratique.
Also known as: Yellow jack, Plain yellow flag on a boat
A solid yellow rectangle. It is the flag a vessel flies on arrival to declare no disease aboard and ask for clearance — the opposite of what a yellow flag means in popular imagination.
Flown alone, Quebec signals that the vessel is healthy and requests free pratique — clearance to enter port after quarantine inspection.
This is the meaning when the flag is flown alone. In a two- or three-letter group it is simply the letter, and the code book gives the group's meaning.
Contexts: Navigation
Popularly remembered as the plague flag, which inverts its meaning. Historically the yellow jack was flown by a vessel *under* quarantine; in the modern code the plain yellow flag is a declaration of health.
The historic and modern uses are opposites, and the historic one is the better known.
A plain yellow rectangular flag carrying no device.