Marine signal flag: Letter "U" (Uniform) Size:3' X 5' British Admiralty Nautical Chart 2056:

British Admiralty Nautical Chart 2056: Indonesia - Sumatera and Jawa

Ibiza and Formentera is a standard nautical chart

British Admiralty Nautical Chart 3942: Ko Lanta Yai to Ko Tarutao is a standard nautical chart

British Admiralty Nautical Chart 967: Palawan is a standard nautical chart

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Marine signal flag: Letter "U" (Uniform) Size:3' X 5' British Admiralty Nautical Chart 2056:International maritime signal message: "You are standing into danger" 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.