Surveys

Underwater operations in progress until 19 nov by M/V aegaeo a. 15 nov in 39-53.48N 025-15.05E

Aegean Sea · HYDROLANT 3542/20

What this record establishes

Archived notice · 2020-11-20 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 1536/20 151238Z NOV 20.. Issued 2020-11-15 12:44Z. 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
Aegean Sea. The parsed report position is 38.196, 24.557. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.

Related notices and cancellation links

Current notices and reporting history in the Aegean Sea →

issued
2020-11-15 12:44Z
status
Archived notice
authority
NAVAREA III 1536/20 151238Z NOV 20.
NAVAREA
NAVAREA III · named as the source of this relay
sea
Aegean Sea
position
38.196, 24.557
vessel
M/V AEGAEO A · 2 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 IN PROGRESS UNTIL 19 NOV
   BY M/V AEGAEO
   A. 15 NOV IN 39-53.48N 025-15.05E.
   B. 16 NOV IN 39-04.77N 026-29.37E.
   C. 17 NOV IN 38-09.88N 025-19.12E.
   D. 18 NOV IN:
        A. 36-54.83N 025-37.25E.
        B. 37-38.83N 023-15.32E.
   E. 19 NOV IN:
         A. 37-58.28N 023-25.87E.
         B. 38-01.10N 023-33.45E.
         C. 37-53.00N 023-32.00E.
   WIDE BERTH REQUESTED.
2. CANCEL HYDROLANT 3522/20.
3. CANCEL THIS MSG 20 NOV 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.
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.
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.

All warning terms →

Collected reports in this area · survey operations

166 within 180 nm since 1999 · 0 in the last 12 months · 0 listed in force now

99
00
05
10
15
20
22

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

J
F
M
A
M
J
J
A
S
O
N
D

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

55 survey operations listed in force · see all

Record snapshot 2026-10-02 02:03Z; 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.