Underwater operations in progress until 07 nov by M/V subsea viking in area bound by 24-36.43S 042-43.75W,…
South Atlantic Ocean · HYDROLANT 3404/18
What this record establishes
Archived notice · 2018-11-08 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 V COASTAL S 806/18 011041Z NOV 18.. Issued 2018-11-01 15:47Z. 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
- Underwater operations in progress until 03 nov by M/V subsea viking in area bound by 24-19S 042-24W, 24-48S…cancelled by this notice
- Two vessels attacked in 04-47S 010-07E at 291250Z octcancelled by this notice
Current notices and reporting history in the South Atlantic Ocean →
- issued
- 2018-11-01 15:47Z
- status
- Archived notice
- authority
- NAVAREA V COASTAL S 806/18 011041Z NOV 18.
- NAVAREA
- NAVAREA V · named as the source of this relay
- issued by
- NAVAREA V COASTAL S
- sea
- South Atlantic Ocean
- position
- -24.491, -42.581
- vessel
- M/V SUBSEA VIKING · 57 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
WESTERN SOUTH ATLANTIC. BRAZIL-SOUTH COAST. DNC 01. 1. UNDERWATER OPERATIONS IN PROGRESS UNTIL 07 NOV BY M/V SUBSEA VIKING IN AREA BOUND BY 24-36.43S 042-43.75W, 24-31.25S 042-46.22W, 24-22.53S 042-26.13W, 24-27.42S 042-23.30W. WIDE BERTH REQUESTED. 2. CANCEL HYDROLANT 3369/18. 3. CANCEL THIS MSG 08 NOV 18.
Reading this warning
- DNC (Digital Nautical Chart)
- A reference to one of the regions of NGA's Digital Nautical Chart, used to tell the reader which charts a warning affects.
- 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.
- 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.
- 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
600 within 180 nm since 2000 · 9 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.
- Survey operations in progress until 030300Z nov by M/V fugro vaquita and an unmanned vessel along trackline…2026-09-12
- Survey operations 07 thru 14 sep by M/V sanco spirit and M/V sea 1 dorado in areas bound by: a. 24-53.20S…2026-09-06
- Underwater operations 1000Z to 2000Z daily 01 thru 30 sep by M/V coral do atlantico in area bound by…2026-09-03
- Survey operations in progress until 24 aug by M/V sea 1 dorado in area bound by 24-53.20S 042-47.12W,…2026-08-21
- Survey operations in progress until 24 aug by M/V sea 1 dorado in area bound by 24-53.20S 042-47.12W,…2026-08-19
- Underwater operations in progress until 280259Z aug by M/V siem pilot in 24-35.02S 042-15.37W2026-08-19
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
55 survey operations listed in force · see all
Record snapshot 2026-10-02 08:27Z; 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.