Surveys

Survey operations in progress until further notice by M/V polarcus adira and M/V polarcus alima towing 12…

Norwegian Sea · HYDROLANT 2215/18

What this record establishes

Archived notice · 2018-07-31 17:11Z

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 I 88/18 080945Z JUL 18.. Issued 2018-07-08 10:06Z. 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
Norwegian Sea. 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 Norwegian Sea →

issued
2018-07-08 10:06Z
status
Archived notice
authority
NAVAREA I 88/18 080945Z JUL 18.
NAVAREA
NAVAREA I · named as the source of this relay
sea
Norwegian Sea
position
63.594, 3.876
vessels
M/V POLARCUS ADIRA · 68 messagesM/V POLARCUS ALIMA · 115 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

NORWEGIAN SEA.
NORWAY.
DNC 20, DNC 21.
1. SURVEY OPERATIONS IN PROGRESS UNTIL FURTHER
   NOTICE BY M/V POLARCUS ADIRA AND
   M/V POLARCUS ALIMA TOWING 12 9000 METER LONG
   CABLES IN AREA BOUND BY
   63-36N 001-43E, 62-54N 005-33E,
   63-43N 005-33E, 64-14N 002-45E.
   SIX MILE BERTH REQUESTED.
2. CANCEL HYDROLANT 1723/18.

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.
Until further notice
The operation or danger has no scheduled end; the warning stays in force until a later message cancels it.
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.

All warning terms →

Collected reports in this area · survey operations

75 within 180 nm since 2008 · 4 in the last 12 months · 1 listed in force now

08
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

Worldwide in the collected sources

50 survey operations listed in force · see all

Record snapshot 2026-09-25 01:06Z; 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.