Survey operations 162300Z to 181500Z dec by M/V kairei towing 1300 meter long cables in area bound by 28-05N…
North Pacific Ocean · HYDROPAC 3716/20
What this record establishes
Archived notice · 2020-12-18 16:00Z
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 XI 487/20 161152Z DEC 20.. Issued 2020-12-16 12:11Z. 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
- North Pacific Ocean. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.
Current notices and reporting history in the North Pacific Ocean →
Activity windows · 1 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2020-12-16 23:00Z | 2020-12-18 15:00Z | — | 40 h |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2020-12-16 12:11Z
- status
- Archived notice
- self-cancels
- 2020-12-18 16:00Z
- authority
- NAVAREA XI 487/20 161152Z DEC 20.
- NAVAREA
- NAVAREA XI · named as the source of this relay
- sea
- North Pacific Ocean
- position
- 28.417, 142.833
- vessel
- M/V KAIREI · 81 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
WESTERN NORTH PACIFIC. JAPAN. DNC 12. 1. SURVEY OPERATIONS 162300Z TO 181500Z DEC BY M/V KAIREI TOWING 1300 METER LONG CABLES IN AREA BOUND BY 28-05N 142-30E, 28-45N 142-30E, 28-45N 143-10E, 28-05N 143-10E. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 181600Z 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.
- Survey operations
- A research or survey vessel is mapping the seabed or water column, often while towing equipment.
- Date-time group (DTG)
- A compact UTC timestamp — day, hour and minute followed by Z — such as 201500Z for the 20th at 15:00 UTC.
- Towed array / streamer
- Equipment towed a long way behind a vessel — sonar, a hydrophone cable, a sampling sled — invisible at the surface.
- Tow / towing
- A vessel towing another vessel, a barge or a structure — slow, hard to manoeuvre, and with a long line between.
- 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
41 within 180 nm since 1999 · 0 in the last 12 months · 0 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 04 thru 21 may by submersible shinkai 6500 and M/V yokosuka in area bound by 28-22.00N…2024-05-03
- Underwater operations 01 thru 07 mar by M/V yokosuka with submersible shinkai 6500 in areas bound by: a.…2024-02-29
- Underwater operations 20 oct thru 06 nov by shinkai 6500, mother ship and yokosuka in areas within three…2023-10-19
- Underwater operations 24 may thru 09 jun by M/V yokosuka with submersible shinkai 6500 in areas bound by: a.…2023-05-23
- Survey operations in progress until 27 nov by M/V kaimei, towing 12000 meter long cable in area bound by…2022-11-20
- Underwater operations 19 oct thru 05 nov by M/V yokosuka with submersible shinkai 6500 in areas bound by: a.…2022-10-18
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
- Chichi shima, futami ko NR.3 light buoy, 27-04.9N 142-11.2E, L.LNav aids · 87.2 nm
Worldwide in the collected sources
55 survey operations listed in force · see all
Record snapshot 2026-10-01 10:43Z; 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.