What is INTERCO or International Code of Signals and its contents in details ?

  1. The First Substitute Always Repeats The Uppermost Signal Flag Of That Class Of Flags Which Immediately Preceeds The Substitute.
  2. The Use Of Substitutes Is To Enable The Same Signal Flag-Either Alphabetical Flag Or Numeral Pendant, To Be Repeated One Or More Times In The Same Group, In Case Only One Set Of Flags Is Carried On Board.
  3. The Second Substitute Always Repeats The Second, And The Third Substitute Repeats The Third Signal Flag, Counting From The Top Of That Class Of Flags Which Immediately Preceeds Them.
  4. No Substitute Can Ever Be Used More Than Once In The Same Group
CHAPTER 6: FLASHING LIGHT SIGNALLING

Signal Made By Flashing Light Is Divided Into The Foll Parts:

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