Surveys

Survey operations in progress until 22 jul in areas bound by: a. 35-54.54N 012-48.96E, 35-54.54N 012-55.38E,…

Mediterranean Sea - Eastern Basin · HYDROLANT 1683/21

What this record establishes

Archived notice · 2021-07-23 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 534/21 250015Z JUN 21.. Issued 2021-06-25 00:24Z. 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 - Eastern Basin. 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 Mediterranean Sea - Eastern Basin →

issued
2021-06-25 00:24Z
status
Archived notice
authority
NAVAREA III 534/21 250015Z JUN 21.
NAVAREA
NAVAREA III · named as the source of this relay
sea
Mediterranean Sea - Eastern Basin
position
36.631, 14.957
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

EASTERN MEDITERRANEAN SEA.
IONIAN SEA.
SICILY.
DNC 09.
1. SURVEY OPERATIONS IN PROGRESS UNTIL
   22 JUL IN AREAS BOUND BY:
   A. 35-54.54N 012-48.96E, 35-54.54N 012-55.38E,
      35-49.02N 012-55.38E, 35-49.02N 012-48.96E.
   B. 36-44.34N 014-40.38E, 36-44.52N 015-07.26E,
      36-44.40N 015-12.18E, 36-25.62N 015-12.24E,
      36-25.62N 014-40.38E.
   C. 37-05.28N 015-18.00E, 37-05.16N 015-23.58E,
      36-40.68N 015-23.52E, 36-40.74N 015-08.16E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 23 JUL 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.
Survey operations
A research or survey vessel is mapping the seabed or water column, often while towing equipment.
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.
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

280 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

56 survey operations listed in force · see all

Record snapshot 2026-10-01 23:03Z; 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.