Cable ops

Seismic survey 010001Z jul to 152359Z sep by M/V wg tasman towing 12 600 meter long cables in area bound by…

Gulf of Guinea · HYDROLANT 1580/13

What this record establishes

Archived notice · 2013-08-24 10:22Z

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 174/13 291652Z JUN 13.. Issued 2013-06-29 17:05Z. 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
Gulf of Guinea. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.

Current notices and reporting history in the Gulf of Guinea →

Activity windows · 1 in this warning

opens (UTC)closes (UTC)locallength
2013-07-01 00:01Z2013-09-15 23:59Z—1847 h 58

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

issued
2013-06-29 17:05Z
status
Archived notice
self-cancels
2013-09-16 00:59Z
authority
NAVAREA II 174/13 291652Z JUN 13.
NAVAREA
NAVAREA II · named as the source of this relay
sea
Gulf of Guinea
position
3.828, 8.085
vessel
M/V WG TASMAN · 108 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

GULF OF GUINEA.
NIGERIA.
1. SEISMIC SURVEY 010001Z JUL TO 152359Z SEP
   BY M/V WG TASMAN TOWING 12 600 METER
   LONG CABLES IN AREA BOUND BY
   04-02N 008-09E, 03-49N 008-18E,
   03-37N 008-02E, 03-51N 007-52E.
   FOUR MILE BERTH REQUESTED.
2. CANCEL THIS MSG 160059Z SEP 13.

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.
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.
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.
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

47 within 180 nm since 2000 · 0 in the last 12 months · 0 listed in force now

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

24 cable & pipeline work listed in force · see all

Record snapshot 2026-10-02 11:25Z; 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.