Surveys

Underwater operations in progress until further notice in: a. 28-19.30S 015-48.20E by M/V gariep

South Atlantic Ocean · HYDROLANT 354/23

What this record establishes

Archived notice · 2023-03-06 10:14Z

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 VII 47/23 140948Z FEB 23.. Issued 2023-02-14 10:21Z. 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
South Atlantic Ocean. The parsed report position is -28.519, 15.992. 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 South Atlantic Ocean →

issued
2023-02-14 10:21Z
status
Archived notice
authority
NAVAREA VII 47/23 140948Z FEB 23.
NAVAREA
NAVAREA VII · named as the source of this relay
sea
South Atlantic Ocean
position
-28.519, 15.992
vessels
M/V CORAL SEA · 154 messagesM/V GARIEP · 131 messagesM/V MAFUTA · 105 messagesM/V MATHILDA GEM · 14 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

EASTERN SOUTH ATLANTIC.
NAMIBIA.
DNC 01.
1. UNDERWATER OPERATIONS IN PROGRESS UNTIL
   FURTHER NOTICE IN:
   A. 28-19.30S 015-48.20E BY M/V GARIEP.
   B. 28-43.40S 016-29.80E BY M/V MATHILDA GEM.
   C. 28-31.10S 015-48.00E BY M/V MAFUTA.
   D. 28-30.70S 015-52.10E BY M/V CORAL SEA.
   TWO MILE BERTH REQUESTED.
2. CANCEL HYDROLANT 353/23.

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.
Underwater operations
Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
Until further notice
The operation or danger has no scheduled end; the warning stays in force until a later message cancels it.
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.

All warning terms →

Collected reports in this area · survey operations

267 within 180 nm since 2003 · 0 in the last 12 months · 0 listed in force now

03
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

55 survey operations listed in force · see all

Record snapshot 2026-10-01 00:39Z; 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.