Exercises

Hazardous operations occur daily from August 18 to 20, 0800Z to 2100Z, within ten miles of 25°06'S 041°13'W.

South Atlantic Ocean · HYDROLANT 1564/26

What this record establishes

Cancelled notice · 2026-08-21 15:40Z

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 2026-08-13 08:32Z. First collected 2026-08-17 13:41Z; last seen in collection 2026-08-23 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 -25.100, -41.217 with a 10.0 nm radius. 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 · 3 in this warning

opens (UTC)	closes (UTC)	local	length
2026-08-18 08:00Z	2026-08-18 21:00Z	—	13 h
2026-08-19 08:00Z	2026-08-19 21:00Z	—	13 h
2026-08-20 08:00Z	2026-08-20 21:00Z	—	13 h

Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.

issued: 2026-08-13 08:32Z
status: Cancelled notice
self-cancels: 2026-08-20 22:00Z
sea: South Atlantic Ocean
position: -25.100, -41.217 · r 10.0 nm
nearest port: Niteroi · 169 nm
source: NGA MSI in-force warnings (DailyMem*.txt) · first seen 2026-08-17 13:41Z

Original warning text

SOUTH ATLANTIC.
1. HAZARDOUS OPERATIONS 0800Z TO 2100Z
   DAILY 18 THRU 20 AUG IN AREA WITHIN
   TEN MILES OF 25-06.00S 041-13.00W.
2. CANCEL THIS MSG 202200Z AUG 26.

Reading this warning

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.
Within a radius of: A circular area — every position within a stated distance of a point.
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.

All warning terms →

Collected reports in this area · military exercises

492 within 180 nm since 2005 · 4 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.

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

Hazardous operations in progress until 060400Z jun 27 in area bound by 24-39.87S 042-29.30W, 24-39.78S…Exercises · 75.3 nm

Worldwide in the collected sources

28 military exercises listed in force · see all

Record snapshot 2026-10-01 11:32Z; 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.