Exercises

Hazardous operations 060400Z to 061600Z apr in area bound by 37-00N 003-00E, 37-00N 003-13E, 36-50N 003-13E,…

Mediterranean Sea - Western Basin · HYDROLANT 919/21

What this record establishes

Archived notice · 2021-04-06 17:00Z

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) · NAVAREA III 341/21 051201Z APR 21.. Issued 2021-04-05 09:07Z. 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: Mediterranean Sea - Western Basin. 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 Mediterranean Sea - Western Basin →

Activity windows · 1 in this warning

opens (UTC)	closes (UTC)	local	length
2021-04-06 04:00Z	2021-04-06 16:00Z	—	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: 2021-04-05 09:07Z
status: Archived notice
self-cancels: 2021-04-06 17:00Z
authority: NAVAREA III 341/21 051201Z APR 21.
NAVAREA: NAVAREA III · named as the source of this relay
sea: Mediterranean Sea - Western Basin
position: 36.917, 3.108
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

WESTERN MEDITERRANEAN SEA.
ALGERIA.
DNC 08.
1. HAZARDOUS OPERATIONS 060400Z TO 061600Z APR
   IN AREA BOUND BY
   37-00N 003-00E, 37-00N 003-13E,
   36-50N 003-13E, 36-50N 003-00E.
2. CANCEL THIS MSG 061700Z APR 21.

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.
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.
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.

All warning terms →

Collected reports in this area · military exercises

41 within 180 nm since 1999 · 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.

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

28 military exercises listed in force · see all

Record snapshot 2026-10-01 19:15Z; 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.