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GB/T 5743-2025Marine pilot (English PDF)

船用操舵仪

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 1, 2025

Implementation date

February 1, 2026

Scope

GB/T 5743-2025 is the English-translated version of 船用操舵仪.

GB/T 5743-2025 is the Chinese national standard covering the autopilot that holds a ship on course — the heading control and the track control that keeps the ship on the planned leg, the override that hands steering back to the helmsman, the track error and the way stability accuracy is worked out as a mean absolute or a root mean square error, the safe distance from the magnetic compass, and the scenarios each control mode is judged in. Track control is new in this edition. It replaces GB/T 5743-2010 and merges three further steering instrument standards into one document. In force from 1 February 2026. Issued on 1 August 2025, it has been in force since 1 February 2026, replacing GB/T 5743-2010.

Document preview — GB/T 5743-2025

National Standard of the People's Republic of China

ICS
47.020.70
Classification
U 65
Replacing
GB/T 5743-2010

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Contents

  • PrefaceIII
  • 1 Scope1
  • 2 Normative references1
  • 3 Terms and Definitions1
  • 4 Technical Requirements2
  • 4.1 General requirements2
  • 4.2 Composition3
  • 4.3 Function3
  • 4.4 Performance7
  • 4.5 Materials9
  • 4.6 Interface9
  • 4.7 Magnetic compass safety distance9
  • 4.8 Environmental Adaptability9
  • 4.9 Enclosure protection10
  • 4.10 Electromagnetic Compatibility10
  • 4.11 Appearance10
  • 5 Test Methods10
  • 5.1 Composition10
  • 5.2 Function10
  • 5.3 Performance12
  • 5.4 Materials13
  • 5.5 Interface13
  • 5.6 Magnetic compass safety distance13
  • 5.7 Environmental Adaptability14
  • 5.8 Enclosure protection14
  • 5.9 Electromagnetic Compatibility14
  • 5.10 Appearance14
  • 6 Inspection Rules14
  • 6.1 Inspection categories14
  • 6.2 Type inspection14
  • 6.3 Factory Inspection15
  • 7 Markings and Labels1616
  • 8 Packaging, transportation and storage16
  • 8.1 Packaging16
  • 8.2 Transportation and storage16
  • Appendix A (Normative) Test Method for Automatic Control of Ship Heading17
  • A.1 Test conditions for automatic ship heading control17
  • A.2 Ship heading automatic control stability accuracy test17
  • A.3 Ship heading maneuvering test17
  • Appendix B (Normative) Ship Track/Track Direction Automatic Control Test Method19
  • B.1 Track automatic control test method19
  • B.2 Track direction automatic control test22
  • Appendix C (Normative) Automatic Control Stability Accuracy and Deviation Calculation Method24
  • C.1 Heading Deviation24
  • C.2 Maximum heading deviation24
  • C.3 Stable Accuracy Calculation Method I --- Mean Absolute Error Calculation Method (MAE)24
  • C.4 Stability Accuracy Calculation Method II --- Root Mean Square Error (RMSE)25
  • Appendix D (Normative) Track Control Scenario Definition26

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

This document replaces GB/T 5743-2010 “Marine automatic steering instrument” and GB/T 10846-1989 “Marine magnetic compass automatic steering instrument”.

GB/T 11876-2007 "General Technical Requirements for Marine Follow-up Pilots" and GB/T 11877-2010 "Gyrocompass for Marine Use" Combined Steering Instrument" and other four steering instrument related standards.

Compared with GB/T 11876-2007, in addition to structural adjustments and editorial changes, the main technical changes are as follows.

— Changed and integrated terms and definitions (see Chapter 3, GB/T 5743-2010, GB/T 10846-1989, GB/T 11877- 2010, Chapter 3 of GB/T 11876-2007);

— Changed and integrated technical requirements (see Chapter 4, GB/T 5743-2010, GB/T 10846-1989, GB/T 11877- 2010, Chapter 4 of GB/T 11876-2007);

— Added "track control" and other requirements and test methods [see 4.3.1.2b) and 5.2.2.2b)];

— Added "override" and other functions (see 4.3.1.3);

— Changed and integrated the test methods (see Chapter 5, GB/T 5743-2010, GB/T 10846-1989, GB/T 11877- 2010, Chapter 5 of GB/T 11876-2007);

— Integrate and modify the inspection rules (see Chapter 6, GB/T 5743-2010, GB/T 10846-1989, GB/T 11877- 2010, Chapter 6 of GB/T 11876-2007);

— Added the test method for automatic control of ship heading (see Appendix A);

— Added the ship track/track direction automatic control test method (see Appendix B);

— Added automatic control stability accuracy and deviation calculation method (see Appendix C);

— Added track control scenario definition (see Appendix D).

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document is proposed and coordinated by the National Technical Committee for Standardization of Marine Electrical and Electronic Equipment (SAC/TC531).

This document was drafted by: China Shipbuilding Industry Corporation No. 707 Research Institute, Jiujiang CSSC Instrument Co., Ltd. (No. 44 Factory 1).

The main drafters of this document are: Liu Jian, Liu Hongguang, Wu Mingxian, Su Chang, Sun Lingyuan, Du Yazhen, Luo Yongping, Ouyang Pan, Liao Yixin, Diao Peiteng, Zhu Wenli, Zhu Jiangtao, Cai Wei, Zhang Yu, and Wang Zhiyong.

The previous versions of this document and the documents it replaces are as follows.

— First issued as GB/T 5743-1985 in 1985, first revised in 1994, second revised in 2010;

— First published in 1989 as GB/T 10846-1989;

— First published as GB/T 11876-1989 in 1989, first revised in 2007;

— First published as GB/T 11877-1989 in 1989, first revised in 1999, second revised in 2010;

— This is the third revision of GB/T 5743, which incorporates GB/T 10846-1989 "General Technical Specifications for Marine Magnetic Compass Automatic Steering Instruments" GB/T 11876-2007 "General Technical Requirements for Marine Follow-up Steering Instruments" and GB/T 11877-2010 "General Technical Requirements for Marine Follow-up Steering Instruments" The contents of "Gyrocompass combined steering instrument". Marine steering gear

1 Scope

This document specifies the technical requirements, inspection rules, marking and labeling, packaging, transportation and storage of marine steering instruments (hereinafter referred to as "steering instruments").

The corresponding test methods are described.

This document applies to the design, manufacture and acceptance of steering gear for steering gear, azimuth thrusters and jet thrusters.

2 Normative references

GB/T 2423.101-2008

GB/T 4208-2017

GB/T 13384

GB/T 31843

GB/T 32065.2

GB/T 32065.4

GB/T 32065.6

GB/T 32065.10

GB/T 32065.14

GB/T 36911

GB/T 37417

IEC 60945

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 Track error

The distance between the vessel's position and the current planned leg of the voyage.

Note. Track deviation is expressed as a negative value when the ship's position is to the left of the current planned course (also known as the planned leg course), and as a positive value when it is to the right (i.e. "left negative"). Right").

3.2 Track keeping accuracy

The degree of conformity between the track control result and the set track.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 29 pages — is available in the English PDF.

Referenced standards

Editions of GB/T 5743

EditionTitleRevisionStatus
GB/T 5743-2025Marine pilotcurrent editionCurrent
GB/T 5743-2010Marine autopilotprevious editionIn force
GB/T 5743-1994General technical specifications of the marine autopilotprevious editionObsolete
GB 5743-1985General specifications of autopilotprevious editionObsolete

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