Underwater operations in progress until 30 nov in area bound by 38-09-06N 121-47-30E, 37-41-32N 121-47-30E,…
Yellow Sea · HYDROPAC 2133/12
What this record establishes
Archived notice · 2012-12-01 00:01Z
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) · NAVAREA XI 499/12 261029Z JUL 12.. Issued 2012-07-26 10:53Z. 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
- Yellow Sea. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.
- issued
- 2012-07-26 10:53Z
- status
- Archived notice
- authority
- NAVAREA XI 499/12 261029Z JUL 12.
- NAVAREA
- NAVAREA XI · named as the source of this relay
- sea
- Yellow Sea
- position
- 37.859, 121.401
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
YELLOW SEA. 1. UNDERWATER OPERATIONS IN PROGRESS UNTIL 30 NOV IN AREA BOUND BY 38-09-06N 121-47-30E, 37-41-32N 121-47-30E, 37-41-32N 121-40-51E, 37-25-43N 121-40-51E, 37-25-43N 121-22-30E, 37-41-32N 121-22-30E, 37-41-32N 120-57-25E, 38-09-06N 120-57-25E. 2. CANCEL THIS MSG 01 DEC 12.
Reading this warning
- 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.
- 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
8 within 180 nm since 2005 · 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.
- Salvage operations in progress until 25 dec within 1.5 miles of 37-38-27.0N 123-07-32.4E2013-09-25
- Salvage operations in progress until 25 oct within 1.5 miles of 37-38-27.0N 123-07-32.4E2013-09-20
- Salvage operations in progress until 31 oct within 1.5 miles of 37-38-27.0N 123-07-32.4E2012-09-06
- Survey operations in progress until 30 sep by vessel towing 8000 meter long cable in area bound by 35-22N…2010-08-17
- Survey operations in progress until 30 nov by vessel towing 5000 meter long cable in area bound by 36-04.8N…2006-10-27
- Survey operations in progress until 31 aug by working vessel towing 3500 meter long cable in area bound by…2005-08-22
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 20:15Z; 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.