Surveys

Underwater operations by M/V aigaio: a. 25 sep in area bound by 37-36.88N 023-43.37E, 37-27.28N 023-47.33E,…

Aegean Sea · HYDROLANT 2903/20

What this record establishes

Archived notice · 2020-09-30 00:01Z

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 1275/20 240001Z SEP 20.. Issued 2020-09-24 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 parsed report position is 35.932, 23.897. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.

Current notices and reporting history in the Aegean Sea →

issued: 2020-09-24 00:36Z
status: Archived notice
authority: NAVAREA III 1275/20 240001Z SEP 20.
NAVAREA: NAVAREA III · named as the source of this relay
sea: Aegean Sea
position: 35.932, 23.897
vessel: M/V AIGAIO · 21 messages
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. UNDERWATER OPERATIONS BY M/V AIGAIO:
   A. 25 SEP IN AREA BOUND BY
      37-36.88N 023-43.37E, 37-27.28N 023-47.33E,
      36-56.87N 023-57.55E.
   B. 26 SEP IN AREA BOUND BY
      35-41.10N 023-25.83E, 35-46.67N 023-48.77E,
      35-45.97N 024-13.75E.
   C. 27 SEP IN AREA BOUND BY
      35-44.95N 024-38.73E, 35-41.43N 025-30.78E,
      35-39.90N 025-55.92E.
   D. 28 SEP ALONG TRACKLINE JOINING
      35-38.50N 026-16.45E, 35-34.93N 025-07.35E.
   E. 29 SEP ALONG TRACKLINE JOINING
      35-15.12N 026-40.08E, 35-22.98N 026-44.93E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 30 SEP 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.
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.
Track line joining: Introduces a route through a series of positions — a cable route, a tow's track or a survey line.
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

185 within 180 nm since 2000 · 0 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

Missile operations 0530Z to sunset daily every wednesday thru saturday until 14 jun and 16 seb thru 31 dec…Missiles · 72.4 nm

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-10-01 13:50Z; 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.