MDN 250/2025

Marine site investigation works south of Kau Yi Chau (approx. five months)

No longer in forceReceived 03 Dec 2025, 00:00 UTCArchived 30 Sept 2026, 12:45 UTC

Warning text

Positions open on the map

MARINE DEPARTMENT NOTICE NO. 250/2025 (Marine Works) Marine Site Investigation to the South of Kau Yi Chau With immediate effect and for a period of approximately five months, marine site investigation works involving drilling of boreholes and cone penetration tests will be carried out in the following works areas: Works Area 1: This area is bounded by straight lines joining the following coordinates (WGS 84 Datum) from (A) to (E): (A) 22-16.95N 114-05.22E (B) 22-16.83N 114-05.53E (C) 22-16.13N 114-04.71E (D) 22-16.07N 114-03.95E (E) 22-16.87N 114-04.18E Works Area 2: This area is bounded by straight lines joining the following coordinates (WGS 84 Datum) from (F) to (H): (F) 22-15.94N 114-04.49E (G) 22-15.26N 114-03.71E (H) 22-15.90N 114-03.90E 2. The works will be carried out by four jack-up barges, three flat-top barges and two dumb lighters. Two tugboats will provide assistance. Vessels engaged in the works will display signals as prescribed in international and local regulations. 3. A working area of approximately 50 metres around each barge and lighter will be established. Yellow marker buoys fitted with yellow flashing lights will be laid to mark the positions of the anchors extending from each flat- top barge and lighter. Yellow flashing lights will be installed at the four corners of each jack-up barge to indicate its position. 4. The hours of work will be from 0700 to 2300 hours. No works will be carried out on Sundays and public holidays. Vessels employed for the works will stay in the works areas outside the hours of work. 5. Vessels navigating in the vicinity should proceed with caution. 6. A drawing showing the works areas is attached to this Notice. This Notice supersedes Marine Department Notice No. 76/2025. Mr. S.F. WONG Director of Marine Marine Department Government of the HKSAR Date: 3 December 2025 Action File Ref.: L/M. No. 8/24 in MD-PD&PS-F01-075-01A-003-P055

Location map

Open on the full map

Analysis

No longer in force

Marine site investigation with borehole drilling and cone penetration tests will be carried out in two works areas south of Kau Yi Chau. Works by jack-up barges, flat-top barges, dumb lighters and tugs, with anchors and marker buoys, for approximately five months from 3 December 2025. Working hours 0700-2300 (no works on Sundays and public holidays). A 50 metre working area around each barge and lighter will be established; vessels should proceed with caution.

Type: Survey operations · severity moderate
Feed: Survey operationsAll warnings of this kind on the map, or as an API feed.
Location: South of Kau Yi Chau
Validity: From 03 Dec 2025, 00:00 UTC
Until 03 May 2026, 00:00 UTCWith immediate effect and for a period of approximately five months. The hours of work will be from 0700 to 2300 hours. No works will be carried out on Sundays and public holidays.
Activity periods: 03 Dec 2025, 07:00 UTC - 03 May 2026, 23:00 UTC (Daily 0700-2300 (no works on Sundays and public holidays) - times given in notice as hours (treated as UTC))
Hazards: marine site investigation (borehole drilling, cone penetration tests), jack-up barges and flat-top barges, dumb lighters and tugs, anchors and mooring lines, marker buoys with flashing lights
Cancels: MDN 76/2025

Worked out automatically from the warning text on 30 Sept 2026, 11:37 UTC. It can be wrong: the official warning text is the authority.

The whole analysis comes with Lagom

This warning's analysis also has:

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

The action for mariners, the keep-clear distance, contacts, ships named, translations and the nearby lights and rescue centres come with Lagom and every higher plan, and with the API plans. The official warning text above is always free.

See the plans

Back to Hong Kong