Underwater operations 0700Z to 1915Z daily 18 mar thru 15 may by M/V surf allamanda in area bound by…
Singapore Strait · HYDROPAC 938/17
What this record establishes
Archived notice · 2017-03-21 20:35Z
This notice comes from the historical archive. Its archived status does not establish when or how the reported situation ended.
- Source and dates
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · SINGAPORE PORT OPERATIONS CONTROL CENTER 180338Z MAR 17.. Issued 2017-03-18 05:15Z. First collected 2026-08-17 13:38Z; last seen in collection 2026-08-17 15:46Z. Collection dates record ingestion, not a new incident or a fresh field observation.
- Location covered
- Singapore Strait. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.
Related notices and cancellation links
Current notices and reporting history in the Singapore Strait →
Activity windows · 59 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2017-03-18 07:00Z | 2017-03-18 19:15Z | — | 12 h 15 |
| 2017-03-19 07:00Z | 2017-03-19 19:15Z | — | 12 h 15 |
| 2017-03-20 07:00Z | 2017-03-20 19:15Z | — | 12 h 15 |
| 2017-03-21 07:00Z | 2017-03-21 19:15Z | — | 12 h 15 |
| 2017-03-22 07:00Z | 2017-03-22 19:15Z | — | 12 h 15 |
| 2017-03-23 07:00Z | 2017-03-23 19:15Z | — | 12 h 15 |
| 2017-03-24 07:00Z | 2017-03-24 19:15Z | — | 12 h 15 |
| 2017-03-25 07:00Z | 2017-03-25 19:15Z | — | 12 h 15 |
| … 51 more | |||
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2017-03-18 05:15Z
- status
- Archived notice
- self-cancels
- 2017-05-15 20:15Z
- authority
- SINGAPORE PORT OPERATIONS CONTROL CENTER 180338Z MAR 17.
- issued by
- SPOCC
- sea
- Singapore Strait
- position
- 1.209, 103.911
- vessel
- M/V SURF ALLAMANDA · 3 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
SINGAPORE STRAIT. DNC 03. 1. UNDERWATER OPERATIONS 0700Z TO 1915Z DAILY 18 MAR THRU 15 MAY BY M/V SURF ALLAMANDA IN AREA BOUND BY 01-12.26N 103-53.92E, 01-12.49N 103-54.10E, 01-13.05N 103-55.04E, 01-12.28N 103-55.04E, 01-12.27N 103-54.16E. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 152015Z MAY 17.
Reading this warning
- DNC (Digital Nautical Chart)
- A reference to one of the regions of NGA's Digital Nautical Chart, used to tell the reader which charts a warning affects.
- Underwater operations
- Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
- Area bound by
- Introduces a list of positions that are the corners of an area — the polygon the warning applies to.
- Position (degrees and minutes)
- How warnings write positions: degrees, a hyphen, then minutes, with N/S and E/W — 49-40.8N 003-43.8W.
- Wide berth requested
- Keep well clear — or, when a distance is given ("TWO MILE BERTH REQUESTED"), at least that far away.
- CANCEL THIS MSG
- The warning's own expiry: a line telling the reader when the message cancels itself.
- Date-time group (DTG)
- A compact UTC timestamp — day, hour and minute followed by Z — such as 201500Z for the 20th at 15:00 UTC.
Collected reports in this area · survey operations
15 within 180 nm since 1999 · 0 in the last 12 months · 0 listed in force now
Counts include repeat notices about the same situation. NGA archive coverage ends 2024-05; live collection began 2026-08-17. The period between them is incomplete. An empty year is not evidence that no hazards occurred.
- Survey operations in progress until 03 nov in area bound by 01-20.28N 104-24.29E, 01-20.28N 104-24.79E,…2019-09-17
- Salvage operations in progress until further notice in area bound by 01-25.99N 104-27.08E, 01-26.21N…2017-12-25
- Salvage operations in progress until 31 dec in area bound by 01-25.99N 104-27.08E, 01-26.21N 104-27.50E,…2017-12-24
- Salvage operations in progress until 27 nov in area bound by 01-26.0N 104-27.1E, 01-26.2N 104-27.5E,…2017-10-23
- Dangerous wreck in 01-25.92N 104-27.39E2017-10-07
- Underwater operations 2300Z to 1115Z commencing daily until 04 jun by M/V surf allamanda in area bound by…2017-05-31
Month of issue in the collected archive
All available years combined. Uneven collection and repeat bulletins affect these counts; this chart does not measure the seasonality or probability of incidents.
Nearby notices listed in force · within 120 nm
- Batu berhanti isolated danger marks light buoy, 01-11.76N 103-52.51E, temporarily removedNav aids · 2.3 nm
- Batu berhanti isolated danger light buoy 01-11.76N 103-52.51E temporarily removedNav aids · 2.3 nm
- Submarine cable repairing works by c/v peter faber, 23 sep to until further noticeCable ops · 14.2 nm
- Cable operations in progress until further notice by cableship peter faber in vicinity 01-16.75N 104-08.14ECable ops · 14.2 nm
Worldwide in the collected sources
56 survey operations listed in force · see all
Record snapshot 2026-10-01 22:21Z; source collection times vary.
Surveys
Hydrographic and scientific survey vessels, often towing long arrays. All current survey operations →
Not for navigation. This is a re-rendering of an official navigational warning for awareness; mariners must use official NAVAREA broadcasts and their national MSI service.