Surveys

Underwater operations 220600Z to 230500Z oct by M/V edda flora along trackline joining 43-19.42N 035-34.75E,…

Black Sea · HYDROLANT 3178/20

What this record establishes

Archived notice · 2020-10-23 06:00Z

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 1386/20 201156Z OCT 20.. Issued 2020-10-20 12:07Z. 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: Black Sea. The map shows the reported line or operation extent; it is not a vessel track. Check the original wording for limits and qualifications.

Current notices and reporting history in the Black Sea →

Activity windows · 1 in this warning

opens (UTC)	closes (UTC)	local	length
2020-10-22 06:00Z	2020-10-23 05:00Z	—	23 h

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

issued: 2020-10-20 12:07Z
status: Archived notice
self-cancels: 2020-10-23 06:00Z
authority: NAVAREA III 1386/20 201156Z OCT 20.
NAVAREA: NAVAREA III · named as the source of this relay
sea: Black Sea
position: 43.368, 35.910
vessel: M/V EDDA FLORA · 21 messages
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

BLACK SEA.
TURKEY.
DNC 10.
1. UNDERWATER OPERATIONS 220600Z TO 230500Z OCT
   BY M/V EDDA FLORA ALONG TRACKLINE JOINING
   43-19.42N 035-34.75E, 43-23.37N 036-04.28E,
   43-24.72N 036-14.51E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 230600Z OCT 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.
Underwater operations: Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
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.
Track line joining: Introduces a route through a series of positions — a cable route, a tow's track or a survey line.
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.
Wide berth requested: Keep well clear — or, when a distance is given ("TWO MILE BERTH REQUESTED"), at least that far away.
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 · survey operations

103 within 180 nm since 2002 · 3 in the last 12 months · 0 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 1000Z to 1130Z daily 30 sep thru 02 oct in area bound by 41-10.77N 040-50.82E,…Exercises · 78 nm

Worldwide in the collected sources

55 survey operations listed in force · see all

Record snapshot 2026-09-25 22:07Z; source collection times vary.

Surveys

Hydrographic and scientific survey vessels, often towing long arrays. All current survey operations →

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.