Seismic survey in progress until 250300Z jul by M/V thales venturer towing 15 meter long cable in area bound…
South Atlantic Ocean · HYDROLANT 1421/03
What this record establishes
Archived notice · 2003-07-25 04:00Z
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 V 869/03 240400Z JUL 03; WZ 956/03 240317Z JUL 03; UK HYDROGRAPHIC OFFICE 23 JUL 03. Issued 2003-07-24 05:20Z. 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
- Dangerous wreck, least depth 11.7 meters, in 51-28.7N 001-23.9Ecancelled by this notice
- Underwater operations in progress until further notice by cableship maersk defender displaying RACON (d)…cancelled by this notice
Current notices and reporting history in the South Atlantic Ocean →
- issued
- 2003-07-24 05:20Z
- status
- Archived notice
- self-cancels
- 2003-07-25 04:00Z
- authority
- NAVAREA V 869/03 240400Z JUL 03; WZ 956/03 240317Z JUL 03; UK HYDROGRAPHIC OFFICE 23 JUL 03
- NAVAREA
- NAVAREA V · named as the source of this relay
- sea
- South Atlantic Ocean
- position
- -23.510, -43.204
- vessel
- M/V THALES VENTURER · 43 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 250300Z JUL BY M/V THALES VENTURER TOWING 15 METER LONG CABLE IN AREA BOUND BY 23-14.2S 043-33.1W, 23-28.0S 042-46.4W, 23-49.3S 042-57.3W, 23-28.6S 043-38.5W. TEN MILE BERTH REQUESTED. 2. CANCEL HYDROLANT 1798/01(37), WRECK REMOVED. 3. CANCEL HYDROLANT 1386/03(37), OPERATIONS COMPLETED. 4. CANCEL THIS MSG 250400Z JUL.
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.
- Date-time group (DTG)
- A compact UTC timestamp — day, hour and minute followed by Z — such as 201500Z for the 20th at 15:00 UTC.
- 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.
- Cancellation reference
- A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
- HYDROLANT
- The U.S. long-range warning series for Atlantic waters outside NAVAREA IV, including the eastern Atlantic, the Mediterranean and adjoining seas.
- Dangerous wreck
- A sunken vessel close enough to the surface to endanger ships, or wreckage reported in the water.
- 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
2098 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 in progress until 30 mar 24 by cableship durable in: a. 24-05.68S 046-30.76W2023-12-27
- Cable operations in progress thru 03 jan 24 by M/V puerto real in area bound by 24-31.30S 042-12.30W,…2023-06-23
- Seismic survey in progress until 09 oct by M/V sw diamond towing nine 225 meter long cables in area bound by…2022-10-07
- Seismic deflector gear adrift in 23-08.50S 042-53.90W at 071300Z sep2019-09-07
- Underwater operations in progress until 132300Z jul by cableship ile de brehat in: a. 24-03.8S 046-29.2W2017-06-15
- Seismic survey 21 thru 28 jan by M/V polarcus adira towing 9000 meter long cable in area bound by 25-06S…2017-01-19
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 23:16Z; 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.