Exercises

Hazardous operations 1100Z to 2100Z daily 01 thru 03 dec in area bound by 24-09S 043-26W, 24-15S 043-47W,…

South Atlantic Ocean · HYDROLANT 3670/20

What this record establishes

Archived notice · 2020-11-27 00:05Z

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 S 858/20 251905Z NOV 20.. Issued 2020-11-25 19:54Z. 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.

Related notices and cancellation links

Current notices and reporting history in the South Atlantic Ocean →

Activity windows · 3 in this warning

opens (UTC)closes (UTC)locallength
2020-12-01 11:00Z2020-12-01 21:00Z—10 h
2020-12-02 11:00Z2020-12-02 21:00Z—10 h
2020-12-03 11:00Z2020-12-03 21:00Z—10 h

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

issued
2020-11-25 19:54Z
status
Archived notice
self-cancels
2020-12-03 22:00Z
authority
NAVAREA V COASTAL S 858/20 251905Z NOV 20.
NAVAREA
NAVAREA V · named as the source of this relay
issued by
NAVAREA V COASTAL S
sea
South Atlantic Ocean
position
-24.366, -43.572
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

WESTERN SOUTH ATLANTIC.
BRAZIL-SOUTH COAST.
DNC 01.
1. HAZARDOUS OPERATIONS 1100Z TO 2100Z DAILY
   01 THRU 03 DEC IN AREA BOUND BY
   24-09S 043-26W, 24-15S 043-47W,
   24-35S 043-42W, 24-29S 043-22W.
2. CANCEL THIS MSG 032200Z DEC 20.

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.

All warning terms →

Collected reports in this area · military exercises

755 within 180 nm since 1999 · 5 in the last 12 months · 1 listed in force now

99
00
05
10
15
20
25
26

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

J
F
M
A
M
J
J
A
S
O
N
D

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

28 military exercises listed in force · see all

Record snapshot 2026-10-02 04:38Z; 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.