Cable ops

Seismic survey in progress until 01 dec by M/V polar marquis towing 12 8100 meter long cables

Gulf of Guinea · HYDROLANT 3321/18

What this record establishes

Archived notice · 2018-11-15 14:27Z

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 417/18 231730Z OCT 18.. Issued 2018-10-23 22:01Z. 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.

Related notices and cancellation links

Current notices and reporting history in the Gulf of Guinea →

issued
2018-10-23 22:01Z
status
Archived notice
authority
NAVAREA II 417/18 231730Z OCT 18.
NAVAREA
NAVAREA II · named as the source of this relay
sea
Gulf of Guinea
position
1.652, 8.767
vessel
M/V POLAR MARQUIS · 34 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

GULF OF GUINEA.
EQUATORIAL GUINEA.
DNC 01.
1. SEISMIC SURVEY IN PROGRESS UNTIL 01 DEC
   BY M/V POLAR MARQUIS
   TOWING 12 8100 METER LONG CABLES.
   IN AREA BOUND BY
   02-10.0N 008-06.0E, 02-10.0N 009-41.2E,
   01-49.5N 009-41.5E, 01-39.5N 009-32.9E,
   01-33.9N 009-31.4E, 01-25.0N 009-22.0E,
   01-25.6N 009-16.8E, 01-25.0N 009-15.7E,
   01-21.8N 009-14.9E, 01-13.2N 009-16.3E,
   01-10.0N 009-14.5E, 01-05.0N 009-13.5E,
   01-05.0N 007-56.0E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 02 DEC 18.

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.
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.
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

58 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

No other collected notice is currently listed in force within this radius. This does not establish safe conditions.

Worldwide in the collected sources

23 cable & pipeline work listed in force · see all

Record snapshot 2026-09-24 23:35Z; 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.