Exercises

Hazardous operations 0600Z to 1300Z daily 16 thru 19, 23 thru 26 mar, 0500Z to 1200Z daily 06 thru 09, 13…

Aegean Sea · HYDROLANT 931/20

What this record establishes

Archived notice · 2020-04-20 13:00Z

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) · TURKEY 136/20 110838Z MAR 20.. Issued 2020-03-11 09:33Z. 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: Aegean Sea. 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 Aegean Sea →

Activity windows · 9 in this warning

opens (UTC)	closes (UTC)	local	length
2020-03-16 06:00Z	2020-03-16 13:00Z	—	7 h
2020-03-17 06:00Z	2020-03-17 13:00Z	—	7 h
2020-03-18 06:00Z	2020-03-18 13:00Z	—	7 h
2020-03-19 06:00Z	2020-03-19 13:00Z	—	7 h
2020-04-06 05:00Z	2020-04-06 12:00Z	—	7 h
2020-04-07 05:00Z	2020-04-07 12:00Z	—	7 h
2020-04-08 05:00Z	2020-04-08 12:00Z	—	7 h
2020-04-09 05:00Z	2020-04-09 12:00Z	—	7 h
… 1 more

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

issued: 2020-03-11 09:33Z
status: Archived notice
self-cancels: 2020-04-20 13:00Z
authority: TURKEY 136/20 110838Z MAR 20.
issued by: TURKEY
sea: Aegean Sea
position: 38.525, 25.108
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

AEGEAN SEA.
DNC 09.
1. HAZARDOUS OPERATIONS 0600Z TO 1300Z DAILY
   16 THRU 19, 23 THRU 26 MAR, 0500Z TO 1200Z
   DAILY 06 THRU 09, 13 THRU 16 APR AND
   200500Z TO 201200Z APR IN AREA BOUND BY
   38-45N 025-21E, 38-45N 024-52E,
   38-18N 024-52E, 38-18N 025-21E.
2. CANCEL THIS MSG 201300Z APR 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.
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

1107 within 180 nm since 1998 · 2 in the last 12 months · 2 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 sunrise to sunset daily until 14 jun and 16 sep thru 31 dec in area bound by 38-16.00N…Exercises · 39.1 nm
Hazardous operations 0500Z to 1500Z daily until 14 jun and 16 sep thru 31 dec except fridays, saturdays,…Exercises · 86.5 nm

Worldwide in the collected sources

9 military exercises listed in force · see all

Record snapshot 2026-10-04 01:17Z; 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.