Surveys

Survey operations 02 may thru 15 jun along trackline joining 40-50-28N 012-52-58E, 40-52-59N 012-18-44E,…

Tyrrhenian Sea · HYDROLANT 1202/21

What this record establishes

Archived notice · 2021-06-16 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 443/21 010102Z MAY 21.. Issued 2021-05-01 01:34Z. 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
Tyrrhenian 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 Tyrrhenian Sea →

issued
2021-05-01 01:34Z
status
Archived notice
authority
NAVAREA III 443/21 010102Z MAY 21.
NAVAREA
NAVAREA III · named as the source of this relay
sea
Tyrrhenian Sea
position
40.954, 10.776
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

WESTERN MEDITERRANEAN SEA.
TYRRHENIAN SEA.
SARDINIA.
ITALY.
DNC 08, DNC 09.
1. SURVEY OPERATIONS 02 MAY THRU 15 JUN
   ALONG TRACKLINE JOINING
   40-50-28N 012-52-58E, 40-52-59N 012-18-44E,
   40-55-39N 011-40-31E, 40-57-26N 011-03-55E,
   40-56-43N 010-24-35E, 41-02-46N 009-33-00E,
   40-59-36N 008-40-12E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 16 JUN 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.
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

150 within 180 nm since 1998 · 0 in the last 12 months · 0 listed in force now

98
00
05
10
15
20
24

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

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

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-10-02 17:15Z; 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.