Underwater operations 16 jul thru 30 nov in areas bound by: a. 51-23-15N 143-51-30E, 51-26-51N 143-49-57E,…
Sea of Okhotsk · HYDROPAC 2067/20
What this record establishes
Archived notice · 2020-12-01 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 XIII 76/20 130917Z JUL 20.. Issued 2020-07-13 09:25Z. 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
- Sea of Okhotsk. 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 Sea of Okhotsk →
- issued
- 2020-07-13 09:25Z
- status
- Archived notice
- authority
- NAVAREA XIII 76/20 130917Z JUL 20.
- NAVAREA
- NAVAREA XIII · named as the source of this relay
- sea
- Sea of Okhotsk
- position
- 51.450, 143.735
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
SEA OF OKHOTSK.
SAKHALIN.
DNC 24.
1. UNDERWATER OPERATIONS 16 JUL THRU 30 NOV
IN AREAS BOUND BY:
A. 51-23-15N 143-51-30E, 51-26-51N 143-49-57E,
51-27-24N 143-49-42E, 51-31-36N 143-47-51E,
51-32-14N 143-52-06E, 51-25-41N 143-55-00E,
51-23-52N 143-55-48E, 51-23-45N 143-55-00E.
B. 51-25-10N 143-27-24E, 51-26-12N 143-27-03E,
51-31-36N 143-47-51E, 51-23-15N 143-51-30E.
WIDE BERTH REQUESTED.
2. CANCEL HYDROPAC 1740/20, 1910/20.
3. CANCEL THIS MSG 01 DEC 20.
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.
- Underwater operations
- Divers or remotely operated vehicles are working below a vessel that cannot easily move out of the way.
- 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.
- HYDROPAC
- The U.S. long-range warning series for the Pacific outside NAVAREA XII and for the Indian Ocean, Persian Gulf and adjoining seas.
- CANCEL THIS MSG
- The warning's own expiry: a line telling the reader when the message cancels itself.
Collected reports in this area · survey operations
134 within 180 nm since 2000 · 5 in the last 12 months · 2 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.
- Survey operations in progress until 25 oct by M/V fyodor kovrov in area bound by 53-46.10N 141-20.00E,…2026-09-19
- Survey operations in progress until 25 oct by M/V fyodor kovrov in area bound by 53-55.97N 142-53.27E,…2026-09-15
- Survey operations in progress until 25 oct by M/V fyodor kovrov in areas bound by: a. 53-55.97N 142-53.27E,…2026-09-14
- Underwater operations 25 may thru 31 dec in area bound by 51-34.92N 143-24.27E, 51-34.90N 144-06.22E,…2026-05-22
- Underwater operations 01 may thru 31 oct in areas bound by: a. 51-27.95N 143-26.72E, 51-29.25N 143-45.52E,…2026-04-23
- Survey operations 25 jun until further notice by vessels in area bound by 52-37.78N 143-52.27E, 52-38.92N…2025-06-24
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
- Underwater operations 01 may thru 31 oct in areas bound by: a. 51-27.95N 143-26.72E, 51-29.25N 143-45.52E,…Surveys · 0.3 nm
- Wave rider buoy established in 51-22.54N 144-14.17ENav aids · 19.3 nm
- Underwater operations 25 may thru 31 dec in area bound by 51-34.92N 143-24.27E, 51-34.90N 144-06.22E,…Surveys · 22.4 nm
Worldwide in the collected sources
56 survey operations listed in force · see all
Record snapshot 2026-10-03 12:12Z; 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.