TABLE OF CONTENTS

United States Fleet Anti-Submarine Instructions

Part VII - PROVISIONS APPLICABLE TO SPECIAL AREAS

Page
7000 GENERAL 7-1
  7010 Convoy Symbols 7-1
  7020 CHOP 7-1
    7021 Routing Instructions 7-1
7100 ATLANTIC AREA 7-1
7200 PACIFIC AREA 7-1
  7210 Diverting Authorities and Areas 7-1
    7211 Convoy Designations 7-1

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United States Fleet Anti-Submarine Instructions

Part VI

COMMUNICATIONS

7000 GENERAL.

  1. Convoys are usually designated by two or three letter symbols which are prefixed to their serial numbers. These symbols indicate the port of departure and destination, and are used for purposes of brevity and convenience.

    1. In employing the convoy symbol the letter designating the point of departure precedes, i.e., a convoy sailing from San Francisco to Pearl Harbor is designated SP, whereas one from Pearl Harbor to San Francisco is designated PS.

    2. Where troop convoys are involved, they shall be designated by the letter "T" in parentheses immediately following the two letter designations.

  1. In the case of a convoy or ship, whose route passes through two or more areas, responsibility is changed from one diverting authority to the other at 1200 GCT of the date on which it is estimated the ship will pass from one area to the other. This date is known as the "CHOP". The CHOP, or CHOPS is the ship passes through more than two areas, is to be indicated in the route signal.

    1. When a diverting authority directs a ship which will subsequently pass through another area, the authority effecting the diversion shall inform the authority into whose area the ship will subsequently pass and will, if necessary, amend the CHOP date.

  1. Communications - In accordance with USF 70 series.

7100 ATLANTIC AREA - (No special provision).

7200 PACIFIC AREA

  1. Pacific Diverting Authorities and Areas of Responsibility. (See current edition "Wartime Pacific Routing Instructions" - Short Title WPRI, issued by Headquarters, U. S. Pacific Fleet and Pacific Ocean Areas.)

    1. Convoy Designations. (See current "General Instructions to Routing and Reporting Officers" - Short Title GIRO - issued by Headquarters, Commander in Chief, U. S. Fleet.)

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