Surveys

Survey operations in progress until 20 apr by M/V W.G

South Atlantic Ocean · HYDROLANT 361/11

What this record establishes

Archived notice · 2011-04-21 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 VII 42/11 031306Z MAR 11; - NAVAREA VII 43/11 031235Z MAR 11.. Issued 2011-03-03 13:56Z. 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 map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.

Related notices and cancellation links

Current notices and reporting history in the South Atlantic Ocean →

issued
2011-03-03 13:56Z
status
Archived notice
authority
NAVAREA VII 42/11 031306Z MAR 11; - NAVAREA VII 43/11 031235Z MAR 11.
NAVAREA
NAVAREA VII · named as the source of this relay
sea
South Atlantic Ocean
position
-7.699, 11.357
vessel
M/V W.G AMUNDSEN
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

EASTERN SOUTH ATLANTIC.
ANGOLA.
1. SURVEY OPERATIONS IN PROGRESS UNTIL 20 APR
   BY M/V W.G. AMUNDSEN IN AREAS BOUND BY:
   A. 07-32.1S 011-04.4E, 07-36.3S 011-28.6E,
      07-36.3S 011-31.9E, 07-36.3S 011-40.8E,
      07-43.8S 011-40.8E, 07-49.9S 011-38.2E,
      07-49.9S 011-04.4E.
   B. 07-33.7S 011-08.2E, 07-33.7S 011-26.1E,
      07-37.9S 011-29.3E, 07-37.9S 011-37.0E,
      07-43.8S 011-37.0E, 07-43.8S 011-35.1E.
   C. 07-36.6S 011-31.6E, 07-31.7S 011-18.9E,
      07-45.6S 011-13.6E, 07-50.6S 011-26.3E.
   WIDE BERTH REQUESTED.
2. CANCEL HYDROLANT 267/11.
3. CANCEL THIS MSG 21 APR.

Reading this warning

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.
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.
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

75 within 180 nm since 2003 · 2 in the last 12 months · 0 listed in force now

03
05
10
15
20
25
26

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 2026-10-02 04:03Z; 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.