Underwater operations in progress until 31 jan within ten miles of 33-40N 128-15E
Japan Sea · HYDROPAC 1021/98
What this record establishes
Archived notice · 1999-02-01 00:00Z
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). Issued 1998-12-28 08:25Z. 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
- Japan Sea. The parsed report position is 33.667, 128.250 with a 10.0 nm radius. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
- issued
- 1998-12-28 08:25Z
- status
- Archived notice
- sea
- Japan Sea
- position
- 33.667, 128.250 · r 10.0 nm
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
1. UNDERWATER OPERATIONS IN PROGRESS UNTIL 31 JAN WITHIN TEN MILES OF 33-40N 128-15E. WIDE BERTH REQUESTED. 2. CANCEL HYDROPAC 1000/98. 3. CANCEL THIS MSG 01 FEB 99.
Reading this warning
- Underwater operations
- Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
- Within a radius of
- A circular area — every position within a stated distance of a point.
- 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.
- Cancellation reference
- A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
- HYDROPAC
- The U.S. long-range warning series for the Pacific outside NAVAREA XII and for the Indian Ocean, Persian Gulf and adjoining seas.
- CANCEL THIS MSG
- The warning's own expiry: a line telling the reader when the message cancels itself.
Collected reports in this area · survey operations
4 within 180 nm since 1998 · 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 27 may by M/V northern endeavour along trackline joining 34-54N 128-59E,…2016-05-25
- Survey operations 21 thru 23 may by M/V northern endeavour in area bound by 35-09N 129-12E, 35-10N 129-13E,…2016-05-20
- Survey operations 20 aug thru 30 sep by M/V geco emerald towing 4500 meter long cable in area bound by…2002-08-17
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
56 survey operations listed in force · see all
Record snapshot 2026-10-01 23:57Z; 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.