Scientific moorings established at three locations in Beaufort Sea, Alaska; top floats at 15, 20, and 19 meters.
Arctic Ocean · HYDROARC 270/23
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 78/23 250604Z OCT 23.. Issued 2023-10-25 06:42Z. 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
- Arctic Ocean. The parsed report position is 71.735, -155.170. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
Related notices and cancellation links
- Scientific moorings established in: a. 71-47.78N 155-20.81W, top float 15 meterscancelled by this notice
- issued
- 2023-10-25 06:42Z
- status
- Cancelled notice
- authority
- NAVAREA XVII 78/23 250604Z OCT 23.
- NAVAREA
- NAVAREA XVII · named as the source of this relay
- sea
- Arctic Ocean
- position
- 71.735, -155.170
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:41Z
Original warning text
BEAUFORT SEA. ALASKA. DNC 27. 1. SCIENTIFIC MOORINGS ESTABLISHED IN: A. 71-47.78N 155-20.81W, TOP FLOAT 15 METERS. B. 71-44.07N 155-09.83W, TOP FLOAT 20 METERS. C. 71-40.38N 154-59.98W, TOP FLOAT 19 METERS. 2. CANCEL HYDROARC 271/22.
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.
- Cancellation reference
- A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
- HYDROARC
- The U.S. long-range warning series for the Arctic Ocean.
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.
- Scientific moorings established: a. BCE-24, in 71-40.40N 154-59.90W, at depth 108 meters, top float 20 meters2024-12-17
- Scientific moorings established in: a. 71-18.16N 155-42.37W2023-08-09
- Scientific moorings established in: a. 70-43.82N 160-22.05W2023-08-09
- Scientific moorings established in: a. 71-47.78N 155-20.81W, top float 15 meters2022-09-11
- Scientific moorings established: a. 71-47.78N 155-20.81W, top float 15 meters2022-09-02
- Scientific moorings established: a. 71-37.87N 157-19.58W, top float 65 meters2022-01-19
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
Worldwide in the collected sources
55 survey operations listed in force · see all
Record snapshot 2026-09-27 19:52Z; 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.