Survey operations by M/V vyacheslav tikhonov: a. 25 aug thru 03 sep in area bound by 50-45-14N 144-34-48E,…
Sea of Okhotsk · HYDROPAC 2401/21
What this record establishes
Archived notice · 2021-10-09 09:14Z
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 63/21 220907Z AUG 21.. Issued 2021-08-22 09:13Z. 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
- Cancel HYDROPAC 2401/21 and this msglater cancellation notice
Current notices and reporting history in the Sea of Okhotsk →
- issued
- 2021-08-22 09:13Z
- status
- Archived notice
- authority
- NAVAREA XIII 63/21 220907Z AUG 21.
- NAVAREA
- NAVAREA XIII · named as the source of this relay
- sea
- Sea of Okhotsk
- position
- 50.123, 145.042
- vessel
- M/V VYACHESLAV TIKHONOV · 45 messages
- 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. SURVEY OPERATIONS BY M/V VYACHESLAV TIKHONOV:
A. 25 AUG THRU 03 SEP IN AREA BOUND BY
50-45-14N 144-34-48E, 50-53-46N 145-20-17E,
49-30-27N 146-00-10E, 49-19-31N 145-14-42E.
B. 04 SEP THRU 15 OCT IN AREA BOUND BY
50-35-31N 143-58-26E, 50-22-50N 145-11-53E,
49-52-12N 145-24-05E, 49-40-55N 144-22-37E.
FOUR MILE BERTH REQUESTED
2. CANCEL THIS MESSAGE 16 OCT 21.
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.
- Survey operations
- A research or survey vessel is mapping the seabed or water column, often while towing equipment.
- 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.
Collected reports in this area · survey operations
108 within 180 nm since 2003 · 2 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.
- 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
- Survey operations in progress until further notice in area bound by 51-20.27N 144-32.12E, 51-17.98N…2025-06-08
- Underwater operations in progress until 31 dec in area bound by 51-34.91N 143-24.26E, 51-34.90N 144-06.22E,…2025-06-05
- Survey operations in progress until 21 oct by M/V trias in area bound by 51-34.92N 143-24.27E, 51-34.90N…2025-06-05
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 25 may thru 31 dec in area bound by 51-34.92N 143-24.27E, 51-34.90N 144-06.22E,…Surveys · 72.2 nm
- Wave rider buoy established in 51-22.54N 144-14.17ENav aids · 81.2 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 · 93.8 nm
Worldwide in the collected sources
56 survey operations listed in force · see all
Record snapshot 2026-10-02 18:09Z; 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.