Seismic survey in progress until further notice by M/V wg amundsen towing 4500 meter long cables in area…
South Atlantic Ocean · HYDROLANT 236/11
What this record establishes
Archived notice · 2011-02-14 13:03Z
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 VII 19/11 081934Z FEB 11.. Issued 2011-02-08 20:03Z. 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 Atlantic 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
Current notices and reporting history in the South Atlantic Ocean →
- issued
- 2011-02-08 20:03Z
- status
- Archived notice
- authority
- NAVAREA VII 19/11 081934Z FEB 11.
- NAVAREA
- NAVAREA VII · named as the source of this relay
- sea
- South Atlantic Ocean
- position
- -7.682, 11.381
- vessel
- M/V WG AMUNDSEN · 49 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN SOUTH ATLANTIC. ANGOLA. SEISMIC SURVEY IN PROGRESS UNTIL FURTHER NOTICE BY M/V WG AMUNDSEN TOWING 4500 METER LONG CABLES IN AREA BOUND BY 07-30.8S 011-18.2E, 07-35.4S 011-32.9E, 07-51.0S 011-27.6E, 07-46.5S 011-12.8E. WIDE BERTH REQUESTED.
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.
- Until further notice
- The operation or danger has no scheduled end; the warning stays in force until a later message cancels it.
- Towed array / streamer
- Equipment towed a long way behind a vessel — sonar, a hydrophone cable, a sampling sled — invisible at the surface.
- Tow / towing
- A vessel towing another vessel, a barge or a structure — slow, hard to manoeuvre, and with a long line between.
- 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 · cable & pipeline work
80 within 180 nm since 1999 · 3 in the last 12 months · 1 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 190001Z sep until further notice by cableship leon thevenin in area bound by 05-27.80S…2026-09-15
- NAVAREA VII 246 of 2026 (24 aug 26) 1. south atlantic ocean - ne sector - offshore orange river mouth 2.…2026-08-24
- Survey operations in progress until 22 aug by cableship nautilus in: a. 06-16.56S 011-14.56E2026-08-04
- Cable operations 121200Z sep until further notice by cableship leon thevenin in area bound by 05-45.43S…2024-09-10
- Cable operations 171200Z jan until further notice by cableship leon thevenin in area bound by 05-37.00S…2024-01-16
- Cable operations 171200Z jan until further noticed by cableship leon thevenin in vicinity of trackline…2024-01-14
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
Worldwide in the collected sources
23 cable & pipeline work listed in force · see all
Record snapshot 2026-09-24 23:29Z; 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.