Marine Signal Flag: Letter "D" (Delta) Official Logbooks British Admiralty Nautical Chart 3937:

British Admiralty Nautical Chart 3937: Ports in Kepulauan Riau is a standard nautical chart

Incorporated inside the red shield

British Admiralty Nautical Chart 2258: Colombia – Panama

British Admiralty Nautical Chart  3892: China - Nan Hai

Red Snapper Sink” are described graphically and with pinpoint coordinates

Marine Signal Flag: Letter "D" (Delta) Official Logbooks British Admiralty Nautical Chart 3937:International maritime signal message: "I am maneuvering with difficulty; keep clear" 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.