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

Written by Vikrant_sharma
Interco is published by her majesties stationery office  –  London

CONTENTS OF INTERCO:

SECTION I:
CHAPTER 1: Explanation and general remarks

1. The purpose of the INTERCO  is to provide ways and means of communication in situations related essentially to safety of navigation and persons, especially when language difficulties arise  in the preparation of the code, account was taken of the fact that wide application of radio telephony/telegraphy can provide simple and effective means of communication in plain language whenever language difficulties do not exist.

2. THE SIGNALS USED CONSISTS OF

  • Single letter signals allocated to significations which are very urgent, important ,or of very common use;
  • Two letter signals for the general section;
  • Three letter signals beginning with ‘m’ for the medical section.

3. COMPLIMENTS EXPRESS

  • VARIATIONS IN THE MEANING OF THE BASIC SIGNAL.

Examples:

  1. ‘CP’ =   ‘I Am ( Or Vessel Indicated Is ) Proceeding To  Your Assistance’.
  2. ‘CP 1’    =  ‘Sar  Aircraft Is Coming To Your Assistance’.
  • QUESTIONS CONCERNING THE SAME BASIC SUBJECT OR BASIC SIGNAL.

Examples:

  1. ‘DY’ =  ‘Vessel ( Name Or Identity Signal ) Has Sunk In Lat….. Long…..’.
  2. ‘DY 4’   =  ‘What Is The Depth Of Water Where The Vessel Sunk?’.
  • ANSWERS TO A QUESTION OR REQUEST MADE BY THE BASIC SIGNAL.

Examples:

  1. ‘HX’ =  ‘Have You Received Any Damage In Collision?’.
  2. ‘HX 1’   =  ‘I Have Received Serious Damage Above The Waterline’.
  • SUPPLEMENTARY, SPECIFIC OR DETAILED INFORMATION.

Examples:

  1. ‘IN’ =  ‘I Require A Diver’.
  2. ‘IN 1’   =  ‘I Require A Diver To Clear Propeller’.

4. COMPLEMENTS APPEARING IN THE TEXT MORE THAN ONCE HAVE BEEN GROUPED IN THREE TABLES. THESE TABLES SHOULD BE USED ONLY AS AND WHEN SPECIFIED IN THE TEXT OF THE SIGNALS.

Example:

  1. An Alternative Eg. : ‘…(Or Survival Craft)…’.
  2. Information Which May Be Transmitted If It Is Required Or If It Is Available, Eg.: ‘…(Position To Be Indicated If Necessary)’ ;
  3. An Explaination Of The Text.
CHAPTER 2: DEFINITIONS
CHAPTER 3: METHODS OF SIGNALLING

     Methods of signalling:

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