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Doc. TC 8/SC 6/WG 8 N 1 R 1
(Draft)
1. Opening of the meeting (09:00)
- Brief address by organizer (if available)
- Brief address by chairman of ISO/TC8/SC6 (if available)
- Opening message by convenor
2. Roll call of delegates
- Self-introduction of attendees
3. Adoption of the Agenda
- Assignment of signatory
4. Convener's message
- Meeting schedule
- Guidance of the logistics (by secretariat)
5. Input documents
- (Doc. TC 8/SC 6/WG 8 N 2) Back ground of the THD (results of the IMO NAV committee)
- (Doc. TC 8/SC 6/WG 8 N 3) Requirements for the THD
- (Doc. TC 8/SC 6/WG 8 N 4) Cross reference table of each part of the standards
- (Doc. TC 8/SC 6/WG 8 N 5*) Draft ISO/CD 22090-2.2 with comments
- (Doc. TC 8/SC 6/WG 8 N 6*) Draft ISO/CD 22090-3 with comments
- (Doc. TC 8/SC 6/WG 8 N 7) Members list of the WG8 experts and drafting group
6. Back ground of the standardization of the THD since IMO NAV (Report)
7. Review of the standard draft DIS
Including observations for the comments on ISO/CD 22090-3 (Part-3 GNSS principle)
8. A.O.B (Any other business)
9. Approval of resolutions
10. Closure of the meeting (12:00)
*To be circulated at the meeting
Doc. TC 8/SC 6/WG 8 N 2
The background of the THD The amendment of a SOLAS chapter V has been discussed through the IMO Navigation sub-committee (NAV).
At the NAV.44, the TMHD (Transmitting Magnetic Heading Device) for heading information sensor equipment was adopted as a performance resolution of simple heading sensing device.
However this amendment now requires that RADAR, EPA and AIS should be installed on all passengers ships and ships of 300g/t and above. These three equipments require a common input of true heading information.
Carriage of Gyrocompass, which satisfies the IMO performance resolution A.424 (XI), and ISO 8728 standard for the vessel over 500 g/t is still a requirement under the regulation 20 of the SOLAS chapter V as amendment. (Before 2002)
The standard for the test method and required test results for the TMHD is being considered in the compass working group of ISO/TC8/SC6, however, it should be recognized that the TMHD derives heading information using the principle of terrestrial magnetism. Thus it cannot directly provide the true heading input required by RADAR, EPA and AIS without some additional correction device.
Furthermore, the NAV. 44 noted that there are many possibilities for the application of technology to providing a ship’s heading sensor.
For example:
1. Magnetic
2. All independent of their surroundings
3. Radio compass
Nevertheless if the carriage requirement is restricted to such magnetic heading devices it is likely to obstruct the future technological developments and the application of other existing technology.
The input requirements of the equipment requiring an input of true heading have been studied in Japan by a group of specialists. As a result there is concern that the provision of heading input to the equipment installed on the size of vessels (300g/t) should not be limited to magnetic devices and that a general performance standard should be developed for application to installed equipment requiring the input of true heading information.
Then new work item for development of an international standard as THD (Transmitting Heading Device), which is no restricted magnetic principle was proposed.
Doc. TC 8/SC 6/WG 8 N 3
1974 SOLAS (amendment 2000)
CHAPTER V
SAFETY OF NAVIGATION
Regulation 18
Approval, surveys and performance standards of navigational systems and equipment and voyage data recorder.
1 Systems and equipment required to meet the requirements of regulation 19 and 20 shall be of a type approved by the Administrations.
2 Systems and equipment, including associated back-up arrangements, where applicable, installed on or after 1 July 2002 to perform the functional requirements of regulation 19 and 20 shall conform to appropriate performance standards not inferior to those adopted by the Organization.
Regulation 19
Carriage requirements for shipborene navigational systems and equipment
2.3 All ships of 300 gross tonnage and upwards and passenger ships irrespective of size shall, in addition to meeting the requirements of paragraph 2.2, be fitted with:
[Note - 2.2: From all ships to 300gt]
.5 A properly adjusted transmitting heading device, or other means to transmit hading information for input to the equipment referred to in paragraphs 2.3.2, 2.3.3 and 2.4.
[Note - 2.3.2: 9GHz RADAR, 2.3.3: EPA, 2.4: AIS]
IMO performance standards for marine transmitting Heading Devices (THDs)
Performance resolution MSC.116 (73)
ISO Ship and marine technology - Transmitting Heading Devices (THDs)
ISO 22090-1 Part- 1 Gyro-compasses
ISO 22090-2 Part- 2 Geo-magnetic principles
ISO 22090-3 Part- 3 GNSS principles
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