Survey work continues off Brazil until 10 October, with three vessels towing 1,500-meter cables; ships should keep clear.
North Atlantic Ocean · HYDROLANT 1938/26
What this record establishes
Cancelled notice · 2026-09-30 15:00Z
This notice disappeared from the issuing source's in-force list. No explicit recovery or all-clear is established by that removal.
- Source and dates
- NGA MSI in-force warnings (DailyMem*.txt). Issued 2026-09-30 09:57Z. First collected 2026-09-30 16:02Z; last seen in collection 2026-10-01 01:47Z. Collection dates record ingestion, not a new incident or a fresh field observation.
- Location covered
- North 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 North Atlantic Ocean →
- issued
- 2026-09-30 09:57Z
- status
- Cancelled notice
- self-cancels
- 2026-10-11 00:01Z
- sea
- North Atlantic Ocean
- position
- 3.906, -48.126
- source
- NGA MSI in-force warnings (DailyMem*.txt) · first seen 2026-09-30 16:02Z
Original warning text
NORTH ATLANTIC. BRAZIL. 1. SURVEY OPERATIONS IN PROGRESS UNTIL 10 OCT BY M/V AMAZON WARRIOR, M/V VENTURE G AND M/V BIG JOHN VII TOWING 12 1500 METER LONG CABLES IN AREA BOUND BY 04-33.71N 050-01.26W, 05-42.36N 048-58.13W, 03-02.99N 046-18.20W, 01-59.67N 047-14.09W, 02-02.36N 047-18.50W, 02-05.99N 047-20.75W, 02-07.44N 047-21.64W, 02-33.17N 047-37.51W, 02-41.94N 047-47.84W, 02-54.27N 047-55.54W, 03-10.64N 048-13.68W, 03-17.80N 048-17.87W, 03-34.64N 048-37.52W, 03-48.19N 048-54.43W, 03-56.43N 049-06.33W, 04-07.01N 049-23.23W, 04-15.75N 049-43.94W. WIDE BERTH REQUESTED. 2. CANCEL HYDROLANT 1875/26. 3. CANCEL THIS MSG 110001Z OCT 26.
Reading this warning
- 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.
- Date-time group (DTG)
- A compact UTC timestamp — day, hour and minute followed by Z — such as 201500Z for the 20th at 15:00 UTC.
Collected reports in this area · survey operations
21 within 180 nm since 2001 · 4 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.
- Survey operations in progress until 03 oct by M/V amazon warrior, M/V venture g and M/V big john VII towing…2026-09-22
- Survey operations in progress until 26 sep by M/V amazon warrior, M/V venture g and M/V big john VII towing…2026-09-15
- Survey operations in progress until 19 sep by M/V amazon warrior, M/V venture g and M/V big john VII towing…2026-09-07
- Survey operations in progress until 112359Z jun by M/V marion dufresne in area bound by 06-59.70N…2023-06-01
- Survey operations in progress until 31 aug by M/V oceanic vega, M/V sanco scorpio and M/V drs retumbante…2023-01-07
- Survey operations in progress until 31 aug by M/V oceanic vega, M/V sanco scorpio and M/V drs retumbante…2023-01-07
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
No other collected notice is currently listed in force within this radius. This does not establish safe conditions.
Worldwide in the collected sources
55 survey operations listed in force · see all
Record snapshot 2026-10-01 01:48Z; 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.