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

• Signals for voice transmissions (radiotelephony or loud- hailer).

Signal	Pronounced as	Meaning
Interco	In-ter-co	International code group(s) follow(s).
Stop	Stop	Full stop
Decimal	Day-see-mal	Decimal point
Correction	Kor rek shun	Cancel my last word or group.the correct word or group follows.

• Signals For Flashing Light Transmissions:
  1. Aa Aa Aaetc: Call For Unknown Station Or General Call.
  2. Eeeeeeeeetc:   Erase Signal
  3. Aaa:  Full Stop Or Decimal Point.
  4. Ttttetc:   Answering Signal.
  5. T: Word Or Group Received.
• Signals For Flags, Radio Telephony Or Radiotelegraphy Transmissions.
  1. Cq:   Call For Unknown Station (S) Or General Call To All Stations.
• Signals For Use Where Appropriate In All Forms Of
  1. ‘AA’ =  “All After…”,(Used After The ‘Repeat Signal'(Rpt)), Means,’Repeat All After…’.
  2. ‘AB‘ =  “All Before…” (Used After The ‘Repeat Signal’ (Rpt)), Means,”Repeat All Before”.
  3. ‘AR’ =  Ending Signal Or End Of Transmission Or Signal.
  4. ‘AS’ =  Waiting Signal Or Period.
  5. ‘BN’ =  ” All Between…. And….” (Used After The”Repeat Signal”(Rpt)), Means “Repeat All Between…. And ….”.
  6. C =  Affirmative – Yes Or “The Significance Of The Previous Group Should Be Read In The Affirmative”.
  7. CS =  “What Is The Name Or Idnetity Signal Of Your Vessel (Or Station)?”.
  8. DE =  “From….” (Used To Precede The Name Or Identity Signal Of The Calling Station).
  9. K =  “I Wish To Communicate With You” Or “Invitation To Transmit”.
  10. NO =  Negative – No. When Used In Voice Transmission The Pronouncation Should Be ‘No’.
  11. OK =  Acknowledging A Correct Repetition Or “It Is Correct”.
  12. RQ = Interrogative.
  13. R =  “Received”.
  14. RPT = Repeat Signal “I Repeat” Or “Repeat What You Have Sent” Or “Repeat What You Have Received”.
  15. WA = “Word Or Group After….”( Used After The ‘Repeat Signal’ (Rpt)) Means “Repeat Word Or Group After…”.
  16. WB = “Word Or Group Before….”( Used After The ‘Repeat Signal’ (Rpt)) Means “Repeat Word Or Group Before…”.

CHAPTER 11: SINGLE LETTER SIGNALS

CHAPTER 12: SINGLE LETTER SIGNALS WITH COMPLEMENTS

• Complement tables include the single letter signal used for such common transmission of signals like course speed distance etc.

CHAPTER 13: SINGLE LETTER SIGNALS BETWEEN ICEBREAKER AND   ASSISTED VESSELS

Wm   =  Ice-Breaker Support Is Now Commencing. Use Signals According To Chpt Xiii Interco.
Wo   =  Ice-Breaker Support Is Finished. Proceed To Your Destination.