Survey operations 02 thru 08 oct by M/V sirius H-21 along trackline joining 19-45S 038-15W, 20-10S 039-25W,…
South Atlantic Ocean · HYDROLANT 1594/04
What this record establishes
Archived notice · 2004-10-09 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 753/04 300407Z SEP 04.. Issued 2004-09-30 09:24Z. 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 the reported line or operation extent; it is not a vessel track. Check the original wording for limits and qualifications.
Current notices and reporting history in the South Atlantic Ocean →
- issued
- 2004-09-30 09:24Z
- status
- Archived notice
- authority
- NAVAREA V 753/04 300407Z SEP 04.
- NAVAREA
- NAVAREA V · named as the source of this relay
- sea
- South Atlantic Ocean
- position
- -18.775, -38.069
- vessel
- M/V SIRIUS H-21 · 2 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
1. SURVEY OPERATIONS 02 THRU 08 OCT BY M/V SIRIUS H-21 ALONG TRACKLINE JOINING 19-45S 038-15W, 20-10S 039-25W, 17-20S 036-50W, 18-49S 038-07W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 09 OCT.
Reading this warning
- Survey operations
- A research or survey vessel is mapping the seabed or water column, often while towing equipment.
- Track line joining
- Introduces a route through a series of positions — a cable route, a tow's track or a survey line.
- 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.
- 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
318 within 180 nm since 2000 · 43 in the last 12 months · 2 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 0800Z to 1800Z daily 02 thru 16 oct by M/V comando b and M/V top weather in 20-23.85S…2026-10-01
- Underwater operations 0800Z to 1800Z daily 28 sep thru 12 oct by M/V calypso and M/V commando b in 20-23.18S…2026-09-27
- Underwater operations 0800Z to 1800Z daily 27 sep thru 11 oct by M/V comando b and M/V prime star in…2026-09-26
- Underwater operations 0800Z to 1800Z daily 26 sep thru 10 oct by M/V comando b in 19-51.63S 039-56.90W2026-09-25
- Underwater operations 0800Z to 1800Z daily 26 sep thru 10 oct by M/V comando b in 20-23.78S 040-09.43W2026-09-25
- Underwater operations 0800Z to 1800Z daily 22 sep thru 06 oct by M/V nord houston and M/V comando b in…2026-09-21
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
56 survey operations listed in force · see all
Record snapshot 2026-10-03 06:36Z; 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.