Seismic survey in progress until 30 jun 06 by M/V nan hai 502 in area bound by 08-55N 117-00E, 08-55N…
South China Sea · HYDROPAC 1791/05
What this record establishes
Archived notice · 2006-07-01 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 522/05 24 OCT 05.. Issued 2005-10-25 11:08Z. 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
- South China 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.
Related notices and cancellation links
Current notices and reporting history in the South China Sea →
- issued
- 2005-10-25 11:08Z
- status
- Archived notice
- authority
- NAVAREA XI 522/05 24 OCT 05.
- NAVAREA
- NAVAREA XI · named as the source of this relay
- sea
- South China Sea
- position
- 10.361, 115.675
- vessel
- M/V NAN HAI 502 · 14 messages
- 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 30 JUN 06 BY M/V NAN HAI 502 IN AREA BOUND BY 08-55N 117-00E, 08-55N 112-45E, 09-50N 112-54E, 09-50N 113-57E, 11-10N 113-57E, 11-10N 114-32E, 11-56N 114-32E, 11-56N 118-00E, 10-52N 118-00E. FIVE MILE BERTH REQUESTED. 2. CANCEL HYDROPAC 1544/05. 3. CANCEL THIS MSG 01 JUL 06.
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.
- 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 · cable & pipeline work
20 within 180 nm since 2001 · 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.
- Seismic survey 20 mar thru 20 may by M/V voyager explorer in area bound by 11-58.0N 117-58.7E, 11-49.2N…2014-03-18
- Cable laying operations in progress until 20 mar by cableship dependable along trackline between 11-57.41N…2013-03-13
- Seismic survey in progress until 28 jan 12 by M/V pacific finder, M/V trb elnusa finder and M/V china…2011-11-08
- Seismic survey in progress until 15 jan 12 by M/V pacific finder, trb elnusa finder and M/V seismic…2011-10-11
- Seismic survey 24 may thru 01 aug by M/V western patriot towing eight 7000 meter long cables in area bound…2011-05-23
- Seismic survey in progress until 30 nov by M/V geowave voyager towing ten 8000 meter long cables in area…2010-09-06
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
24 cable & pipeline work listed in force · see all
Record snapshot 2026-10-01 23:32Z; 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.