Underwater survey in progress until 220400Z dec by M/V argonaut with equipment along trackline between…
Tyrrhenian Sea · HYDROLANT 4192/00
What this record establishes
Archived notice · 2000-12-22 05:00Z
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) · MARDIPART LA SPEZIA 411/00 200830Z DEC 00. Issued 2000-12-22 00:41Z. 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
- Tyrrhenian Sea. The map shows the reported line or operation extent; it is not a vessel track. Check the original wording for limits and qualifications.
Current notices and reporting history in the Tyrrhenian Sea →
- issued
- 2000-12-22 00:41Z
- status
- Archived notice
- self-cancels
- 2000-12-22 05:00Z
- authority
- MARDIPART LA SPEZIA 411/00 200830Z DEC 00
- issued by
- MARDIPART LA SPEZIA
- sea
- Tyrrhenian Sea
- position
- 41.460, 12.169
- vessel
- M/V ARGONAUT · 7 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
1. UNDERWATER SURVEY IN PROGRESS UNTIL 220400Z DEC BY M/V ARGONAUT WITH EQUIPMENT ALONG TRACKLINE BETWEEN 41-18.4N 012-04.7E AND 41-36.8N 012-15.6E. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 220500Z DEC.
Reading this warning
- 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.
- Track line joining
- Introduces a route through a series of positions — a cable route, a tow's track or a survey line.
- 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
107 within 180 nm since 1997 · 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 in progress until further notice by M/V joides resolution in: a. 40-11.03N 012-42.49E2024-02-16
- Survey operations 20 aug thru 17 sep by M/V dallaporta in area bound by 40-38.53N 010-05.00E, 41-20.54N…2022-08-18
- Survey operations in progress until 25 nov by M/V artic in area bound by 43-11.30N 009-34.20E, 43-13.19N…2021-11-09
- Survey operations 25 sep thru 06 oct by M/V kommandor iona in area bound by 43-11.18N 009-34.12E, 43-13.11N…2021-09-23
- Survey operations 28 aug thru 05 sep by M/V dalla porta in area bound by 41-20.54N 009-46.56E, 41-19.72N…2021-08-26
- Survey operations 28 aug thru 05 sep by M/V dalla porta in area bound by 43-28.78N 007-43.51E, 42-11.06N…2021-08-26
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
55 survey operations listed in force · see all
Record snapshot 2026-10-01 07:23Z; 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.