Surveys

Scientific buoys temporarily established by M/V thalassa 15 jul thru 30 aug in: a. dyfamed, 43-25.00N…

Mediterranean Sea - Western Basin · HYDROLANT 1561/23

What this record establishes

Archived notice · 2023-08-31 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 51/23 242252Z JUN 23.. Issued 2023-07-11 04:44Z. 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: Mediterranean Sea - Western Basin. The parsed report position is 42.731, 5.327. 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 Mediterranean Sea - Western Basin →

issued: 2023-07-11 04:44Z
status: Archived notice
self-cancels: 2023-08-31 00:01Z
authority: NAVAREA III 51/23 242252Z JUN 23.
NAVAREA: NAVAREA III · named as the source of this relay
sea: Mediterranean Sea - Western Basin
position: 42.731, 5.327
vessel: M/V THALASSA · 139 messages
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

WESTERN MEDITERRANEAN SEA.
FRANCE.
SPAIN.
DNC 08.
1. SCIENTIFIC BUOYS TEMPORARILY ESTABLISHED
   BY M/V THALASSA 15 JUL THRU 30 AUG IN:
   A. DYFAMED, 43-25.00N 007-54.00E.
   B. LION, 42-02.40N 004-40.50E.
   C. LACAZE, 42-25.70N 003-32.60E.
   D. PLANIER, 43-02.30N 005-11.30E.
   WIDE BERTH REQUETED.
2. CANCEL THIS MSG 310001Z AUG 23.

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.
Scientific mooring: Instruments anchored to the seabed and held up by floats, sometimes just below the surface, left for months to measure the ocean.
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.
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 · survey operations

137 within 180 nm since 1998 · 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

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

Worldwide in the collected sources

55 survey operations listed in force · see all

Record snapshot 2026-10-01 07:24Z; 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.