MDN 216/2024

SÉCURITÉ

Temporary acoustic monitors on seabed in western waters of Hong Kong

No longer in forceReceived 20 Nov 2024, 00:00 UTCArchived 30 Sept 2026, 12:45 UTC

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MARINE DEPARTMENT NOTICE NO. 216/2024 (Marine Works) Temporary Establishment of Acoustic Monitors for Dolphin Survey in the Western Waters of Hong Kong With immediate effect and for a period of approximately 16 months, acoustic monitors will be temporarily established on the seabed in the following locations (WGS 84 Datum): (A) 22-21.32N 113-53.64E (B) 22-20.29N 113-53.90E (C) 22-20.65N 113-55.47E (D) 22-20.16N 113-57.83E (E) 22-17.63N 113-52.75E (F) 22-18.55N 113-52.55E (G) 22-19.73N 113-52.17E 2. The acoustic monitor is an instrument for collecting dolphin data. It will be fixed to a cubic metal frame of 0.5 metre by 0.5 metre by 0.5 metre on the seabed. The total height of the acoustic monitor and the metal frame above the seabed will be about 1 metre. Laying of the acoustic monitors will be carried out by a work boat and a working area of approximately 20 metres around the work boat will be established. One guard boat will provide assistance. Vessels engaged in the works will display signals as prescribed in international and local regulations. 3. The hours of work will be from 0700 to 1900 hours. No works will be carried out on Sundays and public holidays. Vessels employed for the works will not stay in the works locations outside the hours of work. 4. Diving operations for retrieving data from the acoustic monitors will be carried out by the work boat in the above locations from time to time. Vessels navigating in the vicinity should proceed with caution and keep clear of the works locations at slow speed, bearing in mind that there are divers working in the locations, and the water depths above these acoustic monitors are reduced. 5. A drawing showing the locations of the acoustic monitors is attached to this Notice. Mr. S.F. WONG Director of Marine Marine Department Government of the HKSAR Date: 20 November 2024 Action File Ref.: L/M. No. 35/24 in MD-PD&PS-F01-075-01A-003-P060

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Analysis

No longer in force

Cancelled by MDN 62/2026

Acoustic monitors for a dolphin survey were temporarily installed on the seabed at seven locations in the western waters of Hong Kong. Installations were made from 20 November 2024 and will remain for approximately 16 months. Workboats (plus one guard boat) laid cubic metal frames about 0.5 m each side with the instrument and frame projecting about 1 m above the seabed; a working area of approximately 20 metres around the work boat will be established. Diving operations to retrieve data will take place from time to time; vessels should proceed with caution and keep clear at slow speed.

Type: Survey operations · severity moderate
Feed: Survey operationsAll warnings of this kind on the map, or as an API feed.
Location: Western waters of Hong Kong
Validity: From 20 Nov 2024, 00:00 UTC
Until 20 Mar 2026, 00:00 UTCWith immediate effect and for a period of approximately 16 months
Activity periods: ? - ? (0700 to 1900 hours daily (times given as local - kept as UTC in notice); no works on Sundays and public holidays; vessels will not stay outside hours)
Hazards: seabed acoustic monitor installations, reduced water depth above monitors, diving operations, workboat and guard boat operations

Worked out automatically from the warning text on 30 Sept 2026, 12:21 UTC. It can be wrong: the official warning text is the authority.

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Action for mariners
Keep-clear distance
Ships named
Translations
Nearby lights and rescue centres

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Keywordsdiving operations divers working keep clear of

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