Task Description
| Task name : |
Update R0112 Leading lights |
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| Leading committee and working group owning the task: | ENG WG 1 | ||||||||||||||||||||||||||
| Tasks associated (*leading) : | |||||||||||||||||||||||||||
| Tags: | Work programme 2025-2027, Work programme 2023-2027 | ||||||||||||||||||||||||||
| Task Leader : | Lingyan Wang | ||||||||||||||||||||||||||
| Task Number : | ENG-2.1.4 | ||||||||||||||||||||||||||
| Standards : | S1020 Marine Aids to Navigation Design and Delivery | ||||||||||||||||||||||||||
| Topic area : | S1020.1 Aids to Navigation signalling | ||||||||||||||||||||||||||
| Task Description : | Update E-112 Leading Lights and 1023 Leading Lines into a guideline | ||||||||||||||||||||||||||
| Objectives of the task : | |||||||||||||||||||||||||||
| Expected outcome : | New Guideline | ||||||||||||||||||||||||||
| Compelling need : | |||||||||||||||||||||||||||
| Strategic Alignment : |
O1 - Innovate, improve, and harmonise Marine Aids to Navigation constantly reflecting changing technology & system obsolescence, changing user needs, operational imperatives, environmental sustainability, and best practice. |
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| Scope : | |||||||||||||||||||||||||||
| Cybersecurity related : |
No |
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| Brief and concise description of the work : to be undertaken and programme mile-stones (where appropriate). | |||||||||||||||||||||||||||
| Expected numbers of sessions for completion : |
Meaning of symbols for sessions :
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| Committee notes : | Origins : | ||||||||||||||||||||||||||
| Approved by Council (Council session/Date) : | 0 | ||||||||||||||||||||||||||
| Notes from the council : | |||||||||||||||||||||||||||
| Status (Text) : | |||||||||||||||||||||||||||
| Status (Colour) : |
On track
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| Remarks : |
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| History of the task : |
2024-10-24 08:01:46 Task Group members: Lingyan Wang, Travis J Rasmussen, Xu Ruqing, Chen Dequan, Aldo Silva Avalos, Jorgen Royal Petersen, Chen Dequan, Sarah Robinson (Partel Keskulla, Marina Bano Terencio – not in real time) The TG worked through a revised working version of Guideline G1023 Design of Leading Lines incorporating numerous intersessional comments by Partel, Marina and Sarah. The progress was limited by the differing time zones as many of the comments discussed were Partel’s and they warranted further discussion. Good progress was made however, on many of the topics raised by Marina and Partel and the group worked through approximately 50 % of the document, noting terminology that required amendment in the corresponding Excel workbook. In particular, the TG spent significant time clarifying terminology and ensuring alignment with other relevant publications including G1148 and R0202&4. Intersessional dates of the 18th/19th November 10:00 UTC have been proposed, to continue review of the document with any participants who may wish to join. 2025-04-17 11:13:17 ENGTGL24 17/04/25: See Task Group report uploaded from ENG20 Output; subsequently Travis undertook some tasks post Paris and has uploaded V3.8 (uploaded here) for the group to consider by next intersessional meeting 11/06/25 10:00 UTC Download ENG20 WG1 Task 2.1.4 - Leading lines-Task Group Report-updated.docx Download ENG14-3.1.1.2 Revised G1023 on Design of Leading Lines_TG Initial Review 10_4_25 V3.8.docx2025-04-17 11:13:24 ENGTGL24 17/04/25: See Task Group report uploaded from ENG20 Output; subsequently Travis undertook some tasks post Paris and has uploaded V3.8 (uploaded here) for the group to consider by next intersessional meeting 11/06/25 10:00 UTC Download ENG20 WG1 Task 2.1.4 - Leading lines-Task Group Report-updated.docx Download ENG14-3.1.1.2 Revised G1023 on Design of Leading Lines_TG Initial Review 10_4_25 V3.8.docx2025-05-04 18:04:27 alisa.nechyporuk 2025-09-08 14:18:16 alisa.nechyporuk 2025-10-13 22:07:47 ENGWG1VC 2025-10-16 13:33:06 ENGWG1VC The task group worked further through the revised working version of Guideline G1023 Design of Leading Lines. The review was focused primarily on the "Daymarks" and "Additional Considerations" chapters as well as the technical review of the whole guideline. The task group will continue to work on the guideline intersessionally based on the comments of this meeting and submit a new version for silent approval in the next meeting. Key outcomes include: 1.The group concurred that both length and width of a rectangular daymark should form an angle of least 1’ for it to be visible. 2.Added a table which gives recommended colours for daymarks observed against some typical backgrounds. 3.Replaced the three formulas for calculating the length of a daymark under three different subtense angles (i.e., 1 minute, 3 minutes, and 6 minutes) with a single universal formula to improve conciseness, allow calculation of both length and width with other angles. 4.Agreed that additional lights designated as passing lights should be given a different colour and character than leading lights due to potential to mislead a mariner. 5.Identified a need to supplement the case of two types of daymarks: backward-tilted daymark and the one with semi-transparent material. Output: ENG14-3.1.1.2 Revised G1023 on Design of Leading Lines_TG Initial Review 10_4_25 V3.11 Action item Lingyan Wang and Partel Keskkyla are requested to update the guideline intersessionally as discussed in ENG21 committee meeting , and submit as input to ENG22 committee meeting. The task group is requested to review the updated guideline intersessionally. The task group is requested to move the three categories of sensitivity and the simplified method of intensity calculation from the guideline to the file-share and IALA Wiki for future reference. |
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