Cable ops

Seismic survey in progress until 30 jan by M/V western patriot towing seven 3000 meter long cables in area…

South Atlantic Ocean · HYDROLANT 271/01

What this record establishes

Archived notice · 2001-01-31 00:00Z

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 V 156/01 AOR-E EGC #174 231238Z JAN 01; NAVCEN ALEXANDRIA 231656Z JAN 01; MARIDIPART LA SPEZIA 36/01 231305Z JAN 01. Issued 2001-01-23 18:03Z. 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
2001-01-23 18:03Z
status
Archived notice
authority
NAVAREA V 156/01 AOR-E EGC #174 231238Z JAN 01; NAVCEN ALEXANDRIA 231656Z JAN 01; MARIDIPART LA SPEZIA 36/01 231305Z JAN 01
NAVAREA
NAVAREA V · named as the source of this relay
sea
South Atlantic Ocean
position
-25.901, -45.042
vessel
M/V WESTERN PATRIOT · 240 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

1. SEISMIC SURVEY IN PROGRESS UNTIL 30 JAN BY M/V WESTERN PATRIOT
   TOWING SEVEN 3000 METER LONG CABLES IN AREA BOUND BY
   25-55S 045-14W, 25-56S 044-25W, 25-53S 045-11W, 26-54S 044-21W.
   THREE MILE BERTH REQUESTED.
2. CANCEL HYDROLANT 238/01(GEN).
3. CANCEL HYDROLANT 240/01(53).
4. CANCEL THIS MSG 31 JAN.

Reading this warning

Seismic survey
A survey that maps the rock beneath the seabed with sound pulses from air guns, recorded on streamers kilometres long.
Towed array / streamer
Equipment towed a long way behind a vessel — sonar, a hydrophone cable, a sampling sled — invisible at the surface.
Tow / towing
A vessel towing another vessel, a barge or a structure — slow, hard to manoeuvre, and with a long line between.
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 · cable & pipeline work

1606 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

23 cable & pipeline work listed in force · see all

Record snapshot 2026-09-25 00:54Z; source collection times vary.

Cable ops

Cable laying, pipeline and seismic operations. All current cable & pipeline work →

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.