Cable ops

Seismic survey in progress until 01 nov by M/V zephyr towing 4.5 mile long cable in area bound by 75-10.20N…

Chukchi Sea · HYDROARC 224/15

What this record establishes

Archived notice · 2015-11-02 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 XXI 38/15 110630Z AUG 15.. Issued 2015-08-11 07:59Z. 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: Chukchi 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.

Current notices and reporting history in the Chukchi Sea →

issued: 2015-08-11 07:59Z
status: Archived notice
authority: NAVAREA XXI 38/15 110630Z AUG 15.
NAVAREA: NAVAREA XXI · named as the source of this relay
sea: Chukchi Sea
position: 71.506, -174.005
vessel: M/V ZEPHYR · 9 messages
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

ARCTIC.
CHUKCHI SEA.
DNC 27.
1. SEISMIC SURVEY IN PROGRESS UNTIL 01 NOV BY
   M/V ZEPHYR TOWING 4.5 MILE LONG CABLE
   IN AREA BOUND BY
   75-10.20N 179-05.00W, 75-10.20N 171-17.20W,
   72-27.00N 169-08.00W, 68-47.00N 169-08.00W,
   66-56.10N 170-07.20W, 68-57.00N 178-00.00W,
   71-54.50N 179-18.70W, 75-10.23N 179-05.00W.
   EIGHT MILE BERTH REQUESTED.
2. CANCEL THIS MSG 02 NOV 15.

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.
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

11 within 180 nm since 2013 · 0 in the last 12 months · 0 listed in force now

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

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 2026-10-03 01:21Z; 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.