Surveys

Survey operations in progress until 18 oct by M/V polar marquis towing 12 8100 meter long cables in area…

Gulf of Guinea · HYDROLANT 1561/18

What this record establishes

Archived notice · 2018-10-19 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 II 215/18 181632Z MAY 18.. Issued 2018-05-18 16:39Z. 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 →

issued
2018-05-18 16:39Z
status
Archived notice
authority
NAVAREA II 215/18 181632Z MAY 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. SURVEY OPERATIONS IN PROGRESS UNTIL 18 OCT
   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 19 OCT 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.
Survey operations
A research or survey vessel is mapping the seabed or water column, often while towing equipment.
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 · survey operations

33 within 180 nm since 2003 · 1 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

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

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-10-03 22:35Z; 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.