Surveys

Survey operations in progress until 10 nov by M/V bgp challenger towing one 12000 meter long cable in area…

North Atlantic Ocean · HYDROLANT 3164/18

What this record establishes

Archived notice · 2018-10-29 17:17Z

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 400/18 081607Z OCT 18.. Issued 2018-10-08 16:10Z. 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
North 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 North Atlantic Ocean →

issued
2018-10-08 16:10Z
status
Archived notice
authority
NAVAREA II 400/18 081607Z OCT 18.
NAVAREA
NAVAREA II · named as the source of this relay
sea
North Atlantic Ocean
position
20.358, -18.633
vessel
M/V BGP CHALLENGER · 82 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

EASTERN NORTH ATLANTIC.
WESTERN SAHARAH.
DNC 01.
1. SURVEY OPERATIONS IN PROGRESS UNTIL 10 NOV
   BY M/V BGP CHALLENGER TOWING ONE 12000 METER
   LONG CABLE IN AREA BOUND BY
   20-45.22N 019-11.13W, 19-53.58N 019-09.17W,
   19-54.13N 018-40.61W, 19-59.60N 018-40.71W,
   20-00.33N 018-03.48W, 20-46.26N 018-04.37W.
   TEN MILE BERTH REQUESTED.
2. CANCEL THIS MSG 11 NOV 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

16 within 180 nm since 2001 · 0 in the last 12 months · 0 listed in force now

01
05
10
15
20
23

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

55 survey operations listed in force · see all

Record snapshot 2026-10-02 06:26Z; 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.