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Flag Substitutes

The ICS flag system utilizes four substitute flags numbered from 1 to 4. These flags are used to indicate a repetition of a flag already displayed on the hoist and thus eliminate the need of having multiple copies of each letter flag on board.

  • Substitute 1

    Substitute 1

  • Substitute 2

    Substitute 2

  • Substitute 3

    Substitute 3

  • Substitute 4

    Substitute 4

Here are some examples how the substitute flags are used:

  • B

    B

  • O

    O

  • Substitute 1

    B

  • Y

    Y

  • B

    B

  • O

    O

  • Substitute 2

    O

  • Y

    Y

  • B

    B

  • Substitute 1

    B

  • Substitute 2

    B

  • Substitute 3

    B