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The meaning of HY signal flag in inland river

It means stop.

"H" stands for "I have a pilot on board"; "Y" stands for "My ship is at anchor".

When the "H" flag rises to the top, it means "docking begins".

The "H" flag is a square flag with white and red vertical direction, which means: "I have finished berthing."

International signal flag. The signal flags of ships all over the world are 1 * * 40 flags, including 26 letter flags, 10 number flags,/kloc-0 answer flags and 3 substitute flags.