Survey operations 30 mar thru 27 apr by M/V sirius along trackline between 17-10S 036-50W and 18-50S 038-10W
South Atlantic Ocean · HYDROLANT 554/05
What this record establishes
Archived notice · 2005-03-29 04:40Z
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 285/05 26 MAR 05.. Issued 2005-03-27 05:12Z. 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.
Related notices and cancellation links
Current notices and reporting history in the South Atlantic Ocean →
- issued
- 2005-03-27 05:12Z
- status
- Archived notice
- authority
- NAVAREA V 285/05 26 MAR 05.
- NAVAREA
- NAVAREA V · named as the source of this relay
- sea
- South Atlantic Ocean
- position
- -18.000, -37.500
- 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. SURVEY OPERATIONS 30 MAR THRU 27 APR BY M/V SIRIUS ALONG TRACKLINE BETWEEN 17-10S 036-50W AND 18-50S 038-10W. 2. CANCEL THIS MSG 28 APR.
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.
- 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
57 within 180 nm since 2000 · 1 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.
- 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
- Survey operations in progress until 02 jul by M/V atlantic guardian in area bound by 20-20.58S 038-21.07W,…2024-05-03
- Survey operations in progress until 210001Z feb by M/V drs ipanema in area bound by 19-27.00S 039-41.00W,…2023-02-04
- Survey operations in progress until 01 aug by M/V drs ipanema in area bound by 19-27.00S 039-41.00W,…2023-02-03
- Survey operations in progress until 20 apr by M/V hai yang shi you 720 towing ten 11112 meter long cables in…2021-04-13
- Survey operations in progress until 06 apr by M/V hai yang shi you 720 towing ten 11112 meter long cables in…2021-03-30
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
- Yellow odas buoy established in 17-58.12S 038-41.48W until 19 octNav aids · 68.1 nm
Worldwide in the collected sources
56 survey operations listed in force · see all
Record snapshot 2026-09-28 15:50Z; 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.