Survey operations in progress until 26 jun by M/V oceanic sirius towing 12 11112 meter long cables in area…
South Atlantic Ocean · HYDROLANT 1666/21
What this record establishes
Archived notice · 2021-06-27 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 282/21 060318Z JUN 21.. Issued 2021-06-23 09:39Z. 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
- 2021-06-23 09:39Z
- status
- Archived notice
- authority
- NAVAREA V 282/21 060318Z JUN 21.
- NAVAREA
- NAVAREA V · named as the source of this relay
- sea
- South Atlantic Ocean
- position
- -23.796, -39.142
- vessel
- M/V OCEANIC SIRIUS · 101 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-SOUTHEAST COAST. DNC 01. 1. SURVEY OPERATIONS IN PROGRESS UNTIL 26 JUN BY M/V OCEANIC SIRIUS TOWING 12 11112 METER LONG CABLES IN AREA BOUND BY 24-55.57S 039-50.52W, 24-56.62S 037-38.60W, 22-35.70S 037-41.73W, 22-50.33S 039-56.13W, 23-32.05S 040-58.21W, 24-01.60S 041-56.43W, 24-13.50S 039-50.52W. WIDE BERTH REQUESTED. 2. CANCEL HYDROLANT 1627/21. 3. CANCEL THIS MSG 27 JUN 21.
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.
- Survey operations
- A research or survey vessel is mapping the seabed or water column, often while towing equipment.
- 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.
- 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
488 within 180 nm since 2000 · 14 in the last 12 months · 3 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.
- Underwater operations in progress until 250259Z sep by M/V siem pilot in 22-25.32S 039-56.55W2026-09-18
- Underwater operations in progress until 240259Z sep by M/V siem pilot in 22-25.32S 039-56.55W2026-09-17
- Survey operations in progress until 030300Z nov by M/V fugro vaquita and an unmanned vessel along trackline…2026-09-12
- Survey operations in progress until 10 nov 27 by M/V rem saltire in area bound by 21-39.40S 039-49.11W,…2026-09-11
- Underwater operations 1000Z to 2000Z daily 01 thru 30 sep by M/V coral do atlantico in area bound by…2026-09-03
- 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
- Underwater operations in progress until 140001Z nov by M/V fugro vaquita in area bound by 22-03.00S…Surveys · 63.7 nm
- Underwater operations in progress until 250259Z sep by M/V siem pilot in 22-25.32S 039-56.55WSurveys · 93.6 nm
- Underwater operations 1000Z to 2000Z daily until 02 nov 26 by M/V fugro vaquita in: a. 22-26.32S 040-25.47WSurveys · 107.5 nm
Worldwide in the collected sources
50 survey operations listed in force · see all
Record snapshot 2026-09-25 05:35Z; 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.