Marine signal flag: Letter "Q" (Quebec) Coastal Waters of Southeast Alaska and British Columbia British Admiralty Nautical Chart 3767:

British Admiralty Nautical Chart 3767: North Sea - Germany and Denmark

British Admiralty Nautical Chart 1425: France

NOAA Nautical Chart 18581: Yaquina Bay and River

Approaches to Puerto de la Luz (Las Palmas) is a standard nautical chart

Daya Wan and Approaches to Huizhou is a standard nautical chart

Marine signal flag: Letter "Q" (Quebec) Coastal Waters of Southeast Alaska and British Columbia British Admiralty Nautical Chart 3767:International maritime signal message: "Ship meets health regs; request clearance into port" Marine signal flags are international signals used by ships at sea to spell out short messages, or more commonly, used individually or in combination they have special meanings.