Hydrographic operations 11 and 12 nov by M/V sirius towing 150 meter long cables within three miles of…
South Atlantic Ocean · HYDROLANT 2109/03
What this record establishes
Archived notice · 2003-11-13 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 V 1289/03 100406Z NOV 03; NAVAREA VI 432/03 100200Z NOV 03. Issued 2003-11-10 08:40Z. 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 parsed report position is -20.687, -40.388 with a 3.0 nm radius. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
Related notices and cancellation links
- Derelict F/V polargorg adrift vicinity 42-18S 061-09Wcancelled by this notice
Current notices and reporting history in the South Atlantic Ocean →
- issued
- 2003-11-10 08:40Z
- status
- Archived notice
- authority
- NAVAREA V 1289/03 100406Z NOV 03; NAVAREA VI 432/03 100200Z NOV 03
- NAVAREA
- NAVAREA V · named as the source of this relay
- sea
- South Atlantic Ocean
- position
- -20.687, -40.388 · r 3.0 nm
- vessel
- M/V SIRIUS · 43 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
1. HYDROGRAPHIC OPERATIONS 11 AND 12 NOV BY M/V SIRIUS TOWING 150 METER LONG CABLES WITHIN THREE MILES OF 20-41.24S 040-23.28W. WIDE BERTH REQUESTED. 2. CANCEL HYDROLANT 2101/03(23), VESSEL IN TOW. 3. CANCEL THIS MSG 13 NOV.
Reading this warning
- 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.
- Within a radius of
- A circular area — every position within a stated distance of a point.
- 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 · tows
1 within 180 nm since 2003 · 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.
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 0800Z to 1800Z daily 26 sep thru 10 oct by M/V comando b in 20-23.78S 040-09.43WSurveys · 21.8 nm
- Foul ground until 06 dec 27 in area bound by 19-53.87S 039-59.68W, 19-54.15S 039-59.27W, 19-53.08S…Wrecks · 52.9 nm
- Underwater operations 0800Z to 1800Z daily 26 sep thru 10 oct by M/V comando b in 19-51.63S 039-56.90WSurveys · 55.5 nm
- Underwater operations 1000Z to 2000Z daily until 02 nov 26 by M/V fugro vaquita in: a. 22-26.32S 040-25.47WSurveys · 105.5 nm
Worldwide in the collected sources
0 tows listed in force · see all
Record snapshot 2026-10-02 04:38Z; source collection times vary.
Towing
Vessels under tow with long or unlit tow lines. All current tows →
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.