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Turning Circle Diameter

The distance perpendicular to the original track between tangents of the vessel’s path when executing a steady-turn at a given rudder angle and speed, usually expressed in ship lengths or cables.

Quick answer: The distance perpendicular to the original track between tangents of the vessel’s path when executing a steady-turn at a given rudder angle and speed, usually expressed in ship lengths or cables.

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Quick answer

The distance perpendicular to the original track between tangents of the vessel’s path when executing a steady-turn at a given rudder angle and speed, usually expressed in ship lengths or cables.

Why it matters

Turning Circle Diameter matters because it supports clear communication in Nav contexts for Deck Officers, Engine Officers, and Masters. It also connects to aviation training and exam language such as STCW, Marlins Test, ISF Watchkeeper, and GMDSS.

Editorial context

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Questions and answers

Questions and answers

What is Turning Circle Diameter?

In this glossary, Turning Circle Diameter refers to: The distance perpendicular to the original track between tangents of the vessel’s path when executing a steady-turn at a given rudder angle and speed, usually expressed in ship lengths or cables.

How is Turning Circle Diameter used in maritime?

In maritime communication, this term appears in contexts such as: "Helmsman: Note turning circle diameter on the pilot card is eight cables; ensure no traffic is inside that radius before commencing emergency turn to port."

Why does Turning Circle Diameter matter in maritime?

Turning Circle Diameter matters because it supports clear communication in Nav contexts for Deck Officers, Engine Officers, and Masters. It also connects to aviation training and exam language such as STCW, Marlins Test, ISF Watchkeeper, and GMDSS.

Who uses Turning Circle Diameter?

Turning Circle Diameter is mainly used by Deck Officers, Engine Officers, and Masters.

What category does Turning Circle Diameter belong to?

In this glossary, Turning Circle Diameter is grouped under Nav. Related pages in this category explain adjacent procedures, commands and operational concepts.

Where does this definition come from?

This definition is sourced from IMO SMCP, STCW Convention, SOLAS, COLREG and published by Protermify Maritime as a static maritime reference page.

Definition

The distance perpendicular to the original track between tangents of the vessel’s path when executing a steady-turn at a given rudder angle and speed, usually expressed in ship lengths or cables.

Operational example

Helmsman: Note turning circle diameter on the pilot card is eight cables; ensure no traffic is inside that radius before commencing emergency turn to port.

Definition language

English reference definition

Source

IMO SMCP, STCW Convention, SOLAS, COLREG

Category

Nav

Exam relevance

  • STCW
  • Marlins Test
  • ISF Watchkeeper
  • GMDSS

Target audience

  • Deck Officers
  • Engine Officers
  • Masters

Related terms

Use the related links below to continue through connected maritime terminology.

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