Seismic survey in progress until 31 oct in area bound by 37-57.8N 121-21.7E, 37-39.6N 122-00.2E, 37-37.7N…
Yellow Sea · HYDROPAC 1550/02
What this record establishes
Archived notice · 2002-11-01 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) · NAVAREA XI 537/02 261315Z AUG 02. Issued 2002-08-26 14:59Z. 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
- 2002-08-26 14:59Z
- status
- Archived notice
- authority
- NAVAREA XI 537/02 261315Z AUG 02
- NAVAREA
- NAVAREA XI · named as the source of this relay
- sea
- Yellow Sea
- position
- 38.320, 122.903
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
1. SEISMIC SURVEY IN PROGRESS UNTIL 31 OCT IN AREA BOUND BY 37-57.8N 121-21.7E, 37-39.6N 122-00.2E, 37-37.7N 123-06.6E, 37-09.2N 123-06.8E, 37-08.5N 123-45.4E, 37-40.0N 124-00.0E, 39-27.1N 124-00.0E, 39-25.1N 123-19.8E, 39-06.1N 123-06.9E, 39-05.4N 122-25.4E, 38-38.4N 121-21.9E. 2. CANCEL THIS MSG 01 NOV.
Reading this warning
- Seismic survey
- A survey that maps the rock beneath the seabed with sound pulses from air guns, recorded on streamers kilometres long.
- 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 · cable & pipeline work
19 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.
- Cable operations 26 thru 31 jul by M/V kddi ocean link in area bound by 35-57.1N 120-52.9E, 35-55.6N…2018-07-25
- Cable operations 28 thru 30 jul by M/V kddi ocean link in area bound by 35-57.1N 120-52.9E, 35-55.6N…2018-07-23
- Cable operations 18 thru 22 jul, alternate 23 thru 28 jul by M/V kddi ocean link in area bound by 35-57.1N…2018-07-13
- Cable operations by M/V kddi ocean link 11 thru 15 jul, alternate 16 thru 20 jul in area bound by 35-57.1N…2018-07-06
- Cable repair operations in progress until 30 jan by cableship lodbrog in vicinity 35-58.6N 120-53.1E2017-01-25
- Cable repair operations 20 thru 27 jan by cableship lodbrog in vicinity 35-52.2N 121-25.8E2017-01-18
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
23 cable & pipeline work listed in force · see all
Record snapshot 2026-10-03 11:23Z; source collection times vary.
Cable ops
Cable laying, pipeline and seismic operations. All current cable & pipeline work →
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.