Surveys

Survey operations 041700Z to 062359Z apr by M/V l'atalante in vicinity of trackline joining 40-46.00N…

Mediterranean Sea - Western Basin · HYDROLANT 711/23

What this record establishes

Archived notice · 2023-04-05 01:10Z

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 28/23 022359Z APR 23.. Issued 2023-04-03 00:26Z. 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 map shows the reported line or operation extent; it is not a vessel track. Check the original wording for limits and qualifications.

Related notices and cancellation links

Current notices and reporting history in the Mediterranean Sea - Western Basin →

Activity windows · 1 in this warning

opens (UTC)closes (UTC)locallength
2023-04-04 17:00Z2023-04-06 23:59Z—54 h 59

Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.

issued
2023-04-03 00:26Z
status
Archived notice
self-cancels
2023-04-07 00:59Z
authority
NAVAREA III 28/23 022359Z APR 23.
NAVAREA
NAVAREA III · named as the source of this relay
sea
Mediterranean Sea - Western Basin
position
40.475, 4.408
vessel
M/V L'ATALANTE · 68 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

WESTERN MEDITERRANEAN SEA.
BALEARIC ISLANDS.
DNC 08.
1. SURVEY OPERATIONS 041700Z TO 062359Z APR
   BY M/V L'ATALANTE IN VICINITY OF
   TRACKLINE JOINING
   40-46.00N 004-43.00E, 40-11.00N 004-06.00E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 070059Z APR 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.
Survey operations
A research or survey vessel is mapping the seabed or water column, often while towing equipment.
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.
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

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

99
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

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-10-01 23:37Z; 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.