Underwater operations in progress until 250259Z sep by M/V siem pilot in 22-25.32S 039-56.55W
South Atlantic Ocean · HYDROLANT 1850/26
What this record establishes
Listed in force
The latest collected record lists this warning as active. This is the status of the notice, not a live observation of conditions at the location.
- Source and dates
- NGA MSI in-force warnings (DailyMem*.txt). Issued 2026-09-18 00:54Z. First collected 2026-09-23 15:02Z; last seen in collection 2026-09-23 15:17Z. Collection dates record ingestion, not a new incident or a fresh field observation.
- Location covered
- South Atlantic Ocean. The parsed report position is -22.422, -39.943. 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
- Underwater operations in progress until 240259Z sep by M/V siem pilot in 22-25.32S 039-56.55Wcancelled by this notice
Current notices and reporting history in the South Atlantic Ocean →
- issued
- 2026-09-18 00:54Z
- status
- Listed in force
- self-cancels
- 2026-09-25 04:00Z
- sea
- South Atlantic Ocean
- position
- -22.422, -39.943
- source
- NGA MSI in-force warnings (DailyMem*.txt) · first seen 2026-09-23 15:02Z
Original warning text
SOUTH ATLANTIC. BRAZIL. 1. UNDERWATER OPERATIONS IN PROGRESS UNTIL 250259Z SEP BY M/V SIEM PILOT IN 22-25.32S 039-56.55W. WIDE BERTH REQUESTED. 2. CANCEL HYDROLANT 1844/26. 3. CANCEL THIS MSG 250400Z SEP 26.
Conditions at the position · now
loading…
MET Norway · NOAA WaveWatch III · HYCOM · GEBCO 2020 · model data at the centroid, not an observation
Collected reports in this area · survey operations
776 within 180 nm since 2000 · 53 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 0800Z to 1800Z daily 22 sep thru 06 oct by M/V nord houston and M/V comando b in…2026-09-21
- Underwater operations 0800Z to 1800Z daily 21 sep thru 05 oct by M/V comando b and M/V lindsaylou in…2026-09-20
- Underwater operations 0800Z to 1800Z daily 21 sep thru 05 oct by M/V comando b and M/V emerald daishan in…2026-09-20
- Underwater operations 0800Z to 1800Z daily 21 sep thru 05 oct by M/V mds ariadne and M/V comando b in…2026-09-20
- Underwater operations 0800Z to 1800Z daily 21 sep thru 05 oct by M/V mds ariadne and M/V comando b in…2026-09-20
- Underwater operations in progress until 240259Z sep by M/V siem pilot in 22-25.32S 039-56.55W2026-09-17
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 1000Z to 2000Z daily until 02 nov 26 by M/V fugro vaquita in: a. 22-26.32S 040-25.47WSurveys · 26.4 nm
- Underwater operations in progress until 140001Z nov by M/V fugro vaquita in area bound by 22-03.00S…Surveys · 31 nm
- RACON at cabo sao tome light 22-02.52S 041-03.17W off air until 28 sepNav aids · 65.8 nm
Worldwide in the collected sources
51 survey operations listed in force · see all
Record snapshot 2026-09-23 15:19Z; 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.