ISO 22090-3:2014

INTERNATIONAL ISO
STANDARD 22090-3
Second edition
2014-03-01
Ships and marine technology —
Transmitting heading devices
(THDs) —
Part 3:
GNSS principles
Navires et technologie maritime — Dispositifs de transmission de
données de pilotage —
Partie 3: Principes pour un système global de navigation par satellites
Reference number
©
ISO 2014
© ISO 2014
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ii © ISO 2014 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Performance and requirements . 3
4.1 Functionality . 3
4.2 Continuous operation . 4
4.3 Presentation of information . 4
4.4 Heading output alignment . 4
4.5 Compensation for brief GNSS signal interruption . 4
4.6 Settling time . 4
4.7 Heading information . 4
4.8 Alert signal . 4
4.9 Interface . 4
5 Accuracy . 5
5.1 General . 5
5.2 Accuracy of transmission data . 5
5.3 Static error (settle point error) . 5
5.4 Dynamic error . 5
5.5 Follow-up error . 5
6 Type tests . 5
6.1 General . 5
6.2 Organization of test conditions . 5
6.3 Settling time test . 6
6.4 Static error test . 6
6.5 Dynamic test. 6
6.6 Follow-up error test . 7
6.7 Back-up test . 7
6.8 Environmental test . 7
6.9 Electromagnetic compatibility test . 8
6.10 Interface test . 8
6.11 Malfunction test . 8
7 Marking and identification . 8
Annex A (informative) Equivalent requirements in ISO 22090-3 and IMO Resolution
MSC.116 (73) . 9
Bibliography .10
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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on the ISO list of patent declarations received (see www.iso.org/patents).
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to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 8, Ships and marine technology, Subcommittee
SC 6, Navigation and ship operations.
This second edition cancels and replaces the first edition (ISO 22090-3:2004), of which has been
technically revised. It also replaces ISO 22090-3:2004/Cor1:2005.
ISO 22090 consists of the following parts, under the general title Ships and marine technology —
Transmitting heading devices (THDs):
— Part 1: Gyro-compasses
— Part 2: Geomagnetic principles
— Part 3: GNSS principles
iv © ISO 2014 – All rights reserved

INTERNATIONAL STANDARD ISO 22090-3:2014(E)
Ships and marine technology — Transmitting heading
devices (THDs) —
Part 3:
GNSS principles
1 Scope
This part of ISO 22090 specifies general requirements, construction, performance, and testing of
transmitting heading device using GNSS principle as required by chapter V, SOLAS 1974 (as amended).
A transmitting heading device (THD) is an electric device that provides information about the ship’s true
heading.
In addition to the general requirements contained in IMO Resolution A.694(17) to which IEC 60945 is
associated and the relevant standard for the sensing part used, the THD equipment shall comply with the
following minimum requirements.
Where the IMO performance standards that apply to the sensing part do not specify a geographical operating
area, the THD shall operate
a) at a maximum rate of turn 20°/s and
b) from 70° latitude south to 70° latitude north as minimum.
The THDs complying with the requirements contained in this part of ISO 22090 can be used for heading
information as contained in chapter V of the SOLAS Convention.
In addition, such THDs should meet the dynamic requirements contained in the HSC Code, chapter 13 for the
carriage of a suitable device providing heading information.
NOTE 1 Several technologies can be used to detect and transmit heading information. It is illogical to
standardize the detection of the heading separately from the transmission of the heading. Therefore, separate
parts of this part of ISO 22090 refer to different technologies. The requirements of this part of ISO 22090 only
apply to the principle of the GNSS. Other technologies are covered in other parts of ISO 22090.
NOTE 2 All requirements that are extracted from the recommendation of IMO Resolution MSC. 116(73) on
performance standards for transmitting heading devices are printed in italics.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 25862, Ships and marine technology — Marine magnetic compasses, binnacles and azimuth reading
devices
IEC 60945, Marine navigation and radiocommunication equipment and systems — General requirements —
Methods of testing and required test results
IEC 61162-1, Maritime navigation and radiocommunication equipment and systems — Digital interfaces —
Part 1: Single talker and multiple listeners
IEC 61162-2, Maritime navigation and radiocommunication equipment and systems — Digital interfaces —
Part 2: Single talker and multiple listeners, high speed transmission
IEC 61924-2, Maritime navigation and radiocommunication equipment and systems — Integrated Navigation
Systems (INS) — Part 2: Modular structure for INS — Operational and performance requirements, methods
of testing and required test results
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
IMO Resolution A.424(XI), Performance standards for gyro-compasses
IMO Resolution A.694(17), General requirements for shipborne radio equipment forming part of the global
maritime distress and safety system (GMDSS) and for electronic navigational aids
IMO Resolution A.813(19), General requirements for electromagnetic compatibility (EMC) for all electrical
and electronic ship’s equipment
IMO Resolution A.821(19), Performance standards for gyro-compasses for high-speed craft
IMO Resolution MSC.116(73), Performance standards for marine transmitting heading devices (THDs)
IMO Resolution MSC.191(79), Performance standards for the presentation of navigation-related information
on shipborne navigational displays
IMO Resolution MSC.252(83), Adoption of the revised performance standards for integrated navigation
system (INS)
IMO Resolution MSC.302(87), Adoption of performance standards for bridge alert management
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
heading
ship’s heading to be input to the THD function
Note 1 to entry: It is defined by the direction of the vertical projection of the fore-and-aft line of the ship onto the
horizontal plane. When measured relative to the true north, magnetic north, or compass north, it is respectively
defined as true heading, magnetic heading, or compass heading, and is usually expressed in degrees as a three-
figure group, star
...