Underwater operations in progress until further notice by three underwater gliders in area bound by…
Indian Ocean · HYDROPAC 924/23
What this record establishes
Archived notice · 2023-05-22 03:07Z
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) · AUSCOAST 59/23 200940Z MAR 23.. Issued 2023-03-20 09:49Z. 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
- Indian Ocean. 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
- Cancel HYDROPAC 924/23 and this msg, operations completedlater cancellation notice
- issued
- 2023-03-20 09:49Z
- status
- Archived notice
- authority
- AUSCOAST 59/23 200940Z MAR 23.
- issued by
- AUSCOAST
- sea
- Indian Ocean
- position
- -13.775, 122.233
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN INDIAN OCEAN. AUSTRALIA. DNC 04. UNDERWATER OPERATIONS IN PROGRESS UNTIL FURTHER NOTICE BY THREE UNDERWATER GLIDERS IN AREA BOUND BY 12-17.00S 120-13.00E, 15-16.00S 120-13.00E, 15-16.00S 124-15.00E, 12-17.00S 124-15.00E. WIDE BERTH REQUESTED.
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.
- Until further notice
- The operation or danger has no scheduled end; the warning stays in force until a later message cancels it.
- 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.
Collected reports in this area · survey operations
55 within 180 nm since 2002 · 4 in the last 12 months · 2 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.
- Underwater operations in progress until further notice by M/V safe boreas in area bound by 12-54.90S…2026-03-29
- Special purpose vessel safe boreas 565905000 supporting underwater operations in an area bounded by…2026-03-29
- Underwater operations in progress until further notice by M/V offshore solution in area bound by 13-46.00S…2026-02-10
- Underwater operations in progress until further notice by M/V safe boreas in 13-12.20S 125-14.30E2025-12-21
- Underwater operations in progress until further notice by M/V dlv 2000 along trackline joining 12-59.00S…2025-09-23
- Underwater operations in progress until further notice by M/V lay vessel 108 in 12-57.87S 124-26.55E2024-01-06
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
No other collected notice is currently listed in force within this radius. This does not establish safe conditions.
Worldwide in the collected sources
54 survey operations listed in force · see all
Record snapshot 2026-09-29 11:18Z; 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.