Surveys

Underwater operations by M/V thalassa: a. 05 aug in 37-36N 038-22W

North Atlantic Ocean · NAVAREA IV 424/12

What this record establishes

Archived notice · 2012-08-08 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 II 246/12 041627Z AUG 12.. Issued 2012-08-04 18:36Z. 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
North Atlantic Ocean. The parsed report position is 38.028, -34.794. 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 North Atlantic Ocean →

issued
2012-08-04 18:36Z
status
Archived notice
self-cancels
2012-08-08 00:01Z
authority
NAVAREA II 246/12 041627Z AUG 12.
NAVAREA
NAVAREA IV
sea
North Atlantic Ocean
position
38.028, -34.794
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

NORTH ATLANTIC.
AZORES.
1. UNDERWATER OPERATIONS BY M/V THALASSA:
   A. 05 AUG IN 37-36N 038-22W.
   B. 06 AUG IN 39-25N 034-06W.
   C. 07 AUG IN 37-04N 031-55W.
2. CANCEL NAVAREA IV 421/12.
3. CANCEL THIS MSG 080001Z AUG 12.

Reading this warning

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.
Cancellation reference
A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
NAVAREA
One of the 21 ocean areas of the World-Wide Navigational Warning Service, each with a coordinator that broadcasts long-range warnings.
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

21 within 180 nm since 2002 · 0 in the last 12 months · 0 listed in force now

02
05
10
15
16

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

55 survey operations listed in force · see all

Record snapshot 2026-10-02 07:15Z; 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.