Surveys

Scientific moorings are established in Beaufort Sea and Chukchi Sea, Alaska at positions 71-18.16N 155-42.37W, 71-22.90N 155-36.16W, 71-24.81N 156-26.47W, 71-27.43N 156-36.35W.

Beaufort Sea · HYDROARC 157/23

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 50/23 090741Z AUG 23.. Issued 2023-08-09 08:28Z. 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: Beaufort Sea. The parsed report position is 71.389, -156.089. 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 Beaufort Sea →

issued: 2023-08-09 08:28Z
status: Cancelled notice
authority: NAVAREA XVII 50/23 090741Z AUG 23.
NAVAREA: NAVAREA XVII · named as the source of this relay
sea: Beaufort Sea
position: 71.389, -156.089
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:41Z

Original warning text

BEAUFORT SEA.
CHUKCHI SEA.
ALASKA.
DNC 27.
SCIENTIFIC MOORINGS ESTABLISHED IN:
A. 71-18.16N 155-42.37W.
B. 71-22.90N 155-36.16W.
C. 71-24.81N 156-26.47W.
D. 71-27.43N 156-36.35W.

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

59 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

Scientific moorings established: a. BCE-24, in 71-40.40N 154-59.90W, at depth 108 meters, top float 20 metersSurveys · 64.3 nm

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-09-28 07:32Z; 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.