Exercises

Hazardous operations: a. 1500Z to 2100Z daily 27 and 28, 0600Z to 1800Z daily 29 and 31 mar in area within…

North Atlantic Ocean · HYDROLANT 661/23

What this record establishes

Archived notice · 2023-03-31 19:00Z

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) · AVURNAV BREST 96/23 241434Z MAR 23.. Issued 2023-03-26 05:30Z. 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
North 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 North Atlantic Ocean →

Activity windows · 1 in this warning

opens (UTC)closes (UTC)locallength
2023-03-31 06:00Z2023-03-31 18:00Z—12 h

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

issued
2023-03-26 05:30Z
status
Archived notice
self-cancels
2023-03-31 19:00Z
authority
AVURNAV BREST 96/23 241434Z MAR 23.
issued by
AVURNAV BREST
sea
North Atlantic Ocean
position
46.039, -6.333
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

BAY OF BISCAY.
EASTERN NORTH ATLANTIC.
FRANCE.
DNC 08.
1. HAZARDOUS OPERATIONS:
   A. 1500Z TO 2100Z DAILY 27 AND 28,
      0600Z TO 1800Z DAILY 29 AND 31 MAR IN AREA
      WITHIN 40 MILES OF 46-00.00N 003-40.00W.
   B. 310600Z TO 311800Z MAR IN AREA WITHIN
      40 MILES OF 46-00.00N 006-20.00W.
2. CANCEL THIS MSG 311900Z MAR 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.
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.
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.
CANCEL THIS MSG
The warning's own expiry: a line telling the reader when the message cancels itself.

All warning terms →

Collected reports in this area · military exercises

507 within 180 nm since 1999 · 0 in the last 12 months · 0 listed in force now

99
00
05
10
15
20
24

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

No other collected notice is currently listed in force within this radius. This does not establish safe conditions.

Worldwide in the collected sources

17 military exercises listed in force · see all

Record snapshot 2026-09-25 08:35Z; 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.