Marine signal flag: Letter "Z" (Zulu) Size:3' X 5' NOAA Nautical Chart 18649: Entrance

NOAA Nautical Chart 18649: Entrance to San Francisco Bay is a standard navigation chart used by commercial and recreational mariners alike

British Admiralty Nautical Chart 51: United States – West Coast

Detailed blow up for Key West Harbor

and a list of additional reading

The third edition has been revised and updated to include:

Marine signal flag: Letter "Z" (Zulu) Size:3' X 5' NOAA Nautical Chart 18649: EntranceInternational maritime signal message: "I require a tug" 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.