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A white rectangle on blue.
Also known as: Papa flag, Code flag Papa
Sometimes confused with: P pennant
The International Code of Signals flag for the letter Papa, whose single-flag meaning is: All persons should report on board as the vessel is about to proceed to sea.
Flown alone, signals: All persons should report on board as the vessel is about to proceed to sea.
Contexts: Public information, Navigation
Among vessels engaged in fishing in sight of one another, the same flag signals instead: My nets have come fast upon an obstruction.
Contexts: Public information, Navigation
Known universally as the Blue Peter, one of the very few signal flags with a popular name of its own.
Contexts: Public information, Navigation
A blue rectangular flag carrying a white rectangle at its centre, roughly a third of the flag's area.