ISO 8728:2024
Ships and marine technology — Marine gyro-compasses

Standard No.

ISO 8728:2024

Release Date

2024

Published By

International Organization for Standardization (ISO)  IX  /  ISO

Latest

ISO 8728:2024

---

Introduction

Core revisions to the standard

Revision dimensions	2014 edition	2024 edition
Alarm management	Basic fault prompt	Integrated BAM system, in compliance with IEC 62923 standard
Interface specification	IEC 61162-1	Added support for IEC 61162-450 Ethernet interface
Test items	Category 7 environmental tests	Added Scorsby station dynamic accuracy test

---

Analysis of key technical requirements

1. Accuracy standards

In areas below 60° latitude, the following must be met:

• Stabilization time ≤6 hours (static/dynamic conditions)
• Fixed-point error ≤0.75°×secφ
• Sudden speed change (20 knots) error ≤2°

2. Construction specifications

Typical application case: The waterproof bearing structure design of the ANSHUTZ series gyrocompass must meet the following requirements:

1. Compass card scale error ±0.2°
2. Azimuth repeater equipped with a horizontal holding mechanism
3. Power supply polarity reverse protection

---

BAM (Battery Alarm Management System)

Alarm ID	Type	Trigger Condition	Priority
3062	System Failure	Gyro Failure	Warning
3022	Power Failure	Main Power Interrupted	Warning

---

Implementation Recommendations

1. Installation Points

• The main compass should be installed at the position with minimum motion
• The deviation between the repeater and the fore and aft reference line of the ship is ≤0.5°
• Maintain a safe distance from the magnetic compass (measured according to IEC 60945)

2. Maintenance strategy

1. Perform a Scorsby table simulation test every 6 months
2. Annual voltage fluctuation test (±10% range)
3. Regularly check the data update rate of the IEC 61162 interface (≥50Hz)

ISO 8728:2024 Referenced Document

• IEC 60945 Maritime navigation and radiocommunication equipment and systems - General requirements - Methods of testing and required test results; Corrigendum 1
• IEC 61162-1 Maritime navigation and radiocommunication equipment and systems - Digital interfaces - Part 1: Single talker and multiple listeners*， 2024-04-04 Update
• IEC 61162-2 Maritime navigation and radiocommunication equipment and systems - Digital interfaces - Part 2: Single talker and multiple listeners, high-speed transmission*， 2024-04-04 Update
• IEC 62288 Maritime navigation and radiocommunication equipment and systems - Presentation of navigation-related information on shipborne navigational displays - General requirements, methods of testing and required test results CONSOLIDATED EDITION*， 2024-11-01 Update
• IEC 62923-1:2018 Maritime navigation and radiocommunication equipment and systems – Bridge alert management – Part 1: Operational and performance requirements@ methods of testing and required test results (Edition 1.0)
• IEC 62923-2 Maritime navigation and radiocommunication equipment and systems – Bridge alert management – Part 2: Alert and cluster identifiers and other additional features (Edition 1.0)

ISO 8728:2024 history

• 2024 ISO 8728:2024 Ships and marine technology — Marine gyro-compasses
• 2023 ISO 8728:2023 Ships and marine technology
• 2014 ISO 8728:2014 Ships and marine technology - Marine gyro-compasses
• 1997 ISO 8728:1997 Ships and Marine Technology - Marine Gyro-Compasses (Third Edition)
• 1987 ISO 8728:1987 Shipbuilding; Marine gyro-compasses

Topics on standards and specifications

Standard and Specification