Underwater operations 0800Z to 1800Z daily 21 sep thru 05 oct by M/V comando b and M/V emerald daishan in…
South Atlantic Ocean · HYDROLANT 1867/26
What this record establishes
Cancelled notice · 2026-09-23 14:45Z
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 2026-09-20 13:36Z. First collected 2026-09-23 15:02Z; last seen in collection 2026-09-23 17:47Z. Collection dates record ingestion, not a new incident or a fresh field observation.
- Location covered
- South Atlantic Ocean. The parsed report position is -20.397, -40.166. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
Current notices and reporting history in the South Atlantic Ocean →
Activity windows · 15 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2026-09-21 08:00Z | 2026-09-21 18:00Z | — | 10 h |
| 2026-09-22 08:00Z | 2026-09-22 18:00Z | — | 10 h |
| 2026-09-23 08:00Z | 2026-09-23 18:00Z | — | 10 h |
| 2026-09-24 08:00Z | 2026-09-24 18:00Z | — | 10 h |
| 2026-09-25 08:00Z | 2026-09-25 18:00Z | — | 10 h |
| 2026-09-26 08:00Z | 2026-09-26 18:00Z | — | 10 h |
| 2026-09-27 08:00Z | 2026-09-27 18:00Z | — | 10 h |
| 2026-09-28 08:00Z | 2026-09-28 18:00Z | — | 10 h |
| … 7 more | |||
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2026-09-20 13:36Z
- status
- Cancelled notice
- self-cancels
- 2026-10-05 19:00Z
- sea
- South Atlantic Ocean
- position
- -20.397, -40.166
- source
- NGA MSI in-force warnings (DailyMem*.txt) · first seen 2026-09-23 15:02Z
Original warning text
SOUTH ATLANTIC. BRAZIL. 1. UNDERWATER OPERATIONS 0800Z TO 1800Z DAILY 21 SEP THRU 05 OCT BY M/V COMANDO B AND M/V EMERALD DAISHAN IN 20-23.82S 040-09.98W. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 051900Z OCT 26.
Collected reports in this area · survey operations
592 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 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 250259Z sep by M/V siem pilot in 22-25.32S 039-56.55W2026-09-18
- 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
Worldwide in the collected sources
51 survey operations listed in force · see all
Record snapshot 2026-09-23 17:48Z; 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.