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Hazardous operation 0500Z to 1700Z daily 31 may thru 04 jun in area bound by 44-45.0N 036-41.5E, 44-33.0N…

Black Sea · HYDROLANT 1439/21

What this record establishes

Archived notice · 2021-06-04 18:00Z

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 490/21 281415Z MAY 21.. Issued 2021-05-28 14:17Z. 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: Black 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 Black Sea →

Activity windows · 5 in this warning

opens (UTC)	closes (UTC)	local	length
2021-05-31 05:00Z	2021-05-31 17:00Z	—	12 h
2021-06-01 05:00Z	2021-06-01 17:00Z	—	12 h
2021-06-02 05:00Z	2021-06-02 17:00Z	—	12 h
2021-06-03 05:00Z	2021-06-03 17:00Z	—	12 h
2021-06-04 05:00Z	2021-06-04 17:00Z	—	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: 2021-05-28 14:17Z
status: Archived notice
self-cancels: 2021-06-04 18:00Z
authority: NAVAREA III 490/21 281415Z MAY 21.
NAVAREA: NAVAREA III · named as the source of this relay
sea: Black Sea
position: 44.488, 36.852
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

BLACK SEA.
RUSSIA.
DNC 10.
1. HAZARDOUS OPERATION 0500Z TO 1700Z DAILY
   31 MAY THRU 04 JUN IN AREA BOUND BY
   44-45.0N 036-41.5E, 44-33.0N 037-06.5E,
   44-25.0N 037-06.5E, 44-14.0N 036-40.0E.
2. CANCEL THIS MSG 041800Z JUN 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.
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 · other warnings

28 within 180 nm since 2001 · 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

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

Worldwide in the collected sources

23 other warnings listed in force · see all

Record snapshot 2026-10-01 12:51Z; source collection times vary.

Other

Everything the classifier did not place elsewhere. All current other warnings →

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.