Surveys

Scientific moorings are established at 70-43.82N 160-22.05W, 70-40.80N 160-12.69W, and 70-39.28N 160-06.17W in the Chukchi Sea, Alaska.

Chukchi Sea · HYDROARC 156/23

What this record establishes

Cancelled notice · 2026-08-14 18:10Z

This notice disappeared from the issuing source's in-force list. No explicit recovery or all-clear is established by that removal.

Source and dates: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · NAVAREA XVII 49/23 090719Z AUG 23.. Issued 2023-08-09 08:19Z. First collected 2026-08-17 13:41Z; last seen in collection 2026-08-17 15:50Z. Collection dates record ingestion, not a new incident or a fresh field observation.
Location covered: Chukchi Sea. The parsed report position is 70.688, -160.227. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.

Current notices and reporting history in the Chukchi Sea →

issued: 2023-08-09 08:19Z
status: Cancelled notice
authority: NAVAREA XVII 49/23 090719Z AUG 23.
NAVAREA: NAVAREA XVII · named as the source of this relay
sea: Chukchi Sea
position: 70.688, -160.227
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:41Z

Original warning text

CHUKCHI SEA.
ALASKA.
DNC 27.
SCIENTIFIC MOORINGS ESTABLISHED IN:
A. 70-43.82N 160-22.05W.
B. 70-40.80N 160-12.69W.
C. 70-39.28N 160-06.17W.

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.
Scientific mooring: Instruments anchored to the seabed and held up by floats, sometimes just below the surface, left for months to measure the ocean.
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.

All warning terms →

Collected reports in this area · survey operations

60 within 180 nm since 2004 · 0 in the last 12 months · 1 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

55 survey operations listed in force · see all

Record snapshot 2026-10-01 06:11Z; 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.