Underwater operations 11 feb thru 11 apr by M/V seaworker in area bound by 38-54.0S 174-15.5E, 38-54.0S…
Tasman Sea · HYDROPAC 466/21
What this record establishes
Archived notice · 2021-02-10 00:55Z
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) · CNW 31/21 092347Z FEB 21.. Issued 2021-02-10 00:43Z. 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
- Tasman Sea. 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
- issued
- 2021-02-10 00:43Z
- status
- Archived notice
- authority
- CNW 31/21 092347Z FEB 21.
- issued by
- CNW
- sea
- Tasman Sea
- position
- -38.942, 174.283
- vessel
- M/V SEAWORKER · 27 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
TASMAN SEA. NEW ZEALAND. DNC 06. 1. UNDERWATER OPERATIONS 11 FEB THRU 11 APR BY M/V SEAWORKER IN AREA BOUND BY 38-54.0S 174-15.5E, 38-54.0S 174-18.5E, 38-59.0S 174-18.5E, 38-59.0S 174-15.5E. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 12 APR 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.
- 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.
- 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
82 within 180 nm since 1999 · 2 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.
- Survey operations in progress until further notice by M/V seasurveyor in area bound by 41-18.40S 174-14.30E,…2026-01-14
- Survey operations in progress until further notice by M/V seaworker in area bound by 41-18.40S 174-14.30E,…2025-11-28
- Survey operations in progress until further notice by M/V seaworker in area bound by 41-18.40S 174-14.30E,…2025-02-06
- Underwater operations 20 feb thru 30 apr by vessel mma vision in areas bound by: a. 38-54.00S 174-18.50E,…2023-02-15
- Survey operations in progress until further notice by M/V seaworker in area bound by 41-15.90S 174-35.80E,…2023-01-13
- One mile berth requested2022-04-02
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
No other collected notice is currently listed in force within this radius. This does not establish safe conditions.
Worldwide in the collected sources
54 survey operations listed in force · see all
Record snapshot 2026-09-29 14:11Z; 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.