Hazardous operations 0900Z to 2130Z daily 31 jul thru 18 aug in area bound by 29-20.53S 049-05.53W,…
South Atlantic Ocean · HYDROLANT 1675/23
What this record establishes
Archived notice · 2023-08-18 22:30Z
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 COASTAL 407/23 260301Z JUL 23.. Issued 2023-07-26 05:37Z. 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 an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.
Current notices and reporting history in the South Atlantic Ocean →
Activity windows · 19 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2023-07-31 09:00Z | 2023-07-31 21:30Z | — | 12 h 30 |
| 2023-08-01 09:00Z | 2023-08-01 21:30Z | — | 12 h 30 |
| 2023-08-02 09:00Z | 2023-08-02 21:30Z | — | 12 h 30 |
| 2023-08-03 09:00Z | 2023-08-03 21:30Z | — | 12 h 30 |
| 2023-08-04 09:00Z | 2023-08-04 21:30Z | — | 12 h 30 |
| 2023-08-05 09:00Z | 2023-08-05 21:30Z | — | 12 h 30 |
| 2023-08-06 09:00Z | 2023-08-06 21:30Z | — | 12 h 30 |
| 2023-08-07 09:00Z | 2023-08-07 21:30Z | — | 12 h 30 |
| … 11 more | |||
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2023-07-26 05:37Z
- status
- Archived notice
- self-cancels
- 2023-08-18 22:30Z
- authority
- NAVAREA V COASTAL 407/23 260301Z JUL 23.
- NAVAREA
- NAVAREA V · named as the source of this relay
- issued by
- NAVAREA V COASTAL
- sea
- South Atlantic Ocean
- position
- -30.303, -49.828
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
WESTERN SOUTH ATLANTIC. BRAZIL. DNC 01. 1. HAZARDOUS OPERATIONS 0900Z TO 2130Z DAILY 31 JUL THRU 18 AUG IN AREA BOUND BY 29-20.53S 049-05.53W, 29-27.03S 049-32.02W, 30-38.02S 050-09.52W, 31-06.52S 050-29.53W, 31-24.03S 050-19.53W. 2. CANCEL THIS MSG 182230Z AUG 23.
Reading this warning
- DNC (Digital Nautical Chart)
- A reference to one of the regions of NGA's Digital Nautical Chart, used to tell the reader which charts a warning affects.
- Hazardous operations
- NGA's heading for activities that make an area dangerous — most often rocket launches, space debris and weapons firings, and some open-ended danger areas.
- 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.
- 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 · military exercises
172 within 180 nm since 2003 · 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.
- Hazardous operations 230800Z to 252130Z sep in area bound by 30-15.00S 049-54.50W, 30-15.00S 050-06.75W,…2026-09-18
- Hazardous operations 290300Z to 292100Z sep in area bound by 32-22.40S 052-12.40W, 32-30.40S 052-14.10W,…2023-09-24
- Hazardous operations 220900Z to 250400Z aug in area bound by 31-28.42S 049-14.03W, 31-13.60S 049-44.45W,…2023-08-17
- Hazardous operations 110900Z to 120400Z in area bound by 31-28.42S 049-14.02W, 31-13.60S 049-44.45W,…2023-08-06
- Hazardous operations 100900Z to 110400Z aug in area bound by 28-29.50S 046-35.63W, 28-12.87S 047-04.53W,…2023-08-06
- Hazardous operations 160900Z to 292100Z jul in area bound by 27-59.52S 048-13.07W, 28-06.34S 048-01.90W,…2023-07-11
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
17 military exercises listed in force · see all
Record snapshot 2026-09-24 23:20Z; source collection times vary.
Exercises
Gunnery, firing and naval exercise areas. All current military exercises →
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.