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Meaning of pilot flag

pi'lot flag"

Pronunciation: [key]
— Naut. Naut.
  1. the flag symbolizing the letter G in the International Code of Signals, flown by itself to request a pilot from a pilot service: a flag of three yellow and three blue vertical stripes.
  2. the flag symbolizing the letter H in the International Code of Signals, flown by itself to indicate that a pilot is on board: a flag with one white and one red vertical stripe.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.