Hazardous operations 240600Z to 241300Z mar, 260700Z to 261200Z MAR,0500Z to 1200Z daily 29 mar thru 01 apr,…
Aegean Sea · HYDROLANT 820/21
What this record establishes
Archived notice · 2021-04-29 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) · NAVAREA III 290/21 240005Z MAR 21.. Issued 2021-03-24 00:36Z. 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.
Related notices and cancellation links
Activity windows · 10 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2021-03-24 06:00Z | 2021-03-24 13:00Z | — | 7 h |
| 2021-03-26 07:00Z | 2021-03-26 12:00Z | — | 5 h |
| 2021-03-29 05:00Z | 2021-03-29 12:00Z | — | 7 h |
| 2021-03-30 05:00Z | 2021-03-30 12:00Z | — | 7 h |
| 2021-03-31 05:00Z | 2021-03-31 12:00Z | — | 7 h |
| 2021-04-01 05:00Z | 2021-04-01 12:00Z | — | 7 h |
| 2021-04-16 11:30Z | 2021-04-16 13:00Z | — | 1 h 30 |
| 2021-04-19 10:40Z | 2021-04-19 13:00Z | — | 2 h 20 |
| … 2 more | |||
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2021-03-24 00:36Z
- status
- Archived notice
- self-cancels
- 2021-04-29 13:00Z
- authority
- NAVAREA III 290/21 240005Z MAR 21.
- NAVAREA
- NAVAREA III · named as the source of this relay
- sea
- Aegean Sea
- position
- 36.786, 23.669
- 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 240600Z TO 241300Z MAR, 260700Z TO 261200Z MAR,0500Z TO 1200Z DAILY 29 MAR THRU 01 APR, 05 THRU 08 APR AND 26 THRU 29 APR, 0500Z TO 0645Z AND 1040Z TO 1300Z DAILY 12, 13 AND 19 THRU 21 APR, 0500Z TO 1300Z DAILY 14 AND 15 APR, 161130Z TO 161300Z APR AND 0500Z TO 0645ZC AND 1040Z TO 1300Z DAILY 19 THRU 21 APR IN AREA BOUND BY 36-56N 023-29E, 36-42N 023-32E, 36-41N 023-48E, 36-47N 023-55E. 2. CANCEL HYDROLANT 656/21. 3. CANCEL THIS MSG 291300Z 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.
- Cancellation reference
- A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
- HYDROLANT
- The U.S. long-range warning series for Atlantic waters outside NAVAREA IV, including the eastern Atlantic, the Mediterranean and adjoining seas.
- CANCEL THIS MSG
- The warning's own expiry: a line telling the reader when the message cancels itself.
Collected reports in this area · military exercises
1002 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.
- Hazardous operations 0500Z to 1500Z daily until 14 jun and 16 sep thru 31 dec except fridays, saturdays,…2026-02-03
- Hazardous operations sunrise to sunset daily until 14 jun and 16 sep thru 31 dec in area bound by 38-16.00N…2026-02-03
- Hazardous operations 0500Z to 1500Z daily 16 jan thru 14 jun and 16 sep thru 31 dec in area bound by…2024-01-16
- Hazardous operations sunrise to sunset 01 jan thru 14 jun and 16 sep thru 31 dec in area bound by 38-16.00N…2024-01-16
- Hazardous operations sunrise to sunset 01 jan thru 14 jun and 16 sep thru 31 dec in area bound by 38-16.00N…2024-01-14
- Hazardous operations sunrise to sunset 01 jan thru 14 jun and 16 sep thru 31 dec 24 in area bound by…2024-01-04
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
31 military exercises listed in force · see all
Record snapshot 2026-09-29 01:03Z; 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.