Survey operations 15 may thru 30 sep by M/V astrea in: a. 43-51-01N 008-16-52E
Tyrrhenian Sea · HYDROLANT 1297/21
What this record establishes
Archived notice · 2021-06-05 16:39Z
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 III 466/21 121942Z MAY 21.. Issued 2021-05-12 19:43Z. 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
- Tyrrhenian Sea. The parsed report position is 41.022, 9.785. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
Related notices and cancellation links
- Cancel HYDROLANT 1301/21 and this msg, operations completedlater cancellation notice
Current notices and reporting history in the Tyrrhenian Sea →
- issued
- 2021-05-12 19:43Z
- status
- Archived notice
- authority
- NAVAREA III 466/21 121942Z MAY 21.
- NAVAREA
- NAVAREA III · named as the source of this relay
- sea
- Tyrrhenian Sea
- position
- 41.022, 9.785
- vessel
- M/V ASTREA · 5 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
WESTERN MEDITERRANEAN SEA. TYRRHENIAN SEA SARDINIA. ITALY. DNC 08, DNC 09. 1. SURVEY OPERATIONS 15 MAY THRU 30 SEP BY M/V ASTREA IN: A. 43-51-01N 008-16-52E. B. 44-05-18N 009-11-00E. C. 43-51-44N 009-33-01E. D. 43-27-17N 009-37-40E. E. 43-17-08N 010-03-42E. F. 42-50-34N 010-01-33E. G. 42-32-01N 010-42-13E. H. 42-19-54N 010-28-09E. I. 42-04-55N 010-53-17E. J. 41-39-25N 011-32-10E. K. 41-23-21N 012-07-28E. L. 40-17-22N 014-11-58E. M. 40-05-03N 014-38-53E. N. 40-21-46N 010-19-58E. O. 40-40-28N 010-14-24E. P. 41-06-13N 010-54-32E. Q. 41-09-26N 009-54-57E. R. 41-19-47N 009-37-18E. S. 41-09-31N 008-28-23E. T. 40-30-46N 007-51-35E. U. 40-23-22N 007-53-31E. V. 40-07-07N 008-07-18E. W. 39-27-38N 008-08-09E. X. 39-23-17N 007-53-18E. Y. 39-04-06N 007-52-14E. Z. 38-47-50N 008-14-12E. AA. 38-26-18N 008-30-54E. BB. 38-43-57N 008-52-03E. CC. 38-47-09N 009-35-30E. DD. 39-25-30N 009-46-42E. WIDE BERTH REQUESTED. 2. CANCEL THIS MSG 01 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.
- 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
199 within 180 nm since 1998 · 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.
- Survey operations in progress until 30 oct by vessel anteos in 39-19.79N 007-50.60E2024-09-03
- Survey operations in progress until 30 jun by M/V ng driller along trackline joining 39-13.99N 007-49.47E,…2024-04-24
- Survey operations in progress until 30 aug by M/V durable along trackline joining 41-22.68N 006-04.83E,…2024-04-24
- Underwater operations in progress until further notice by M/V joides resolution in: a. 40-11.03N 012-42.49E2024-02-16
- Survey operations in progress until 15 apr by M/V ng driller in: a. 39-13.99N 007-49.48E2024-02-01
- Survey operations 22 jul thru 13 aug by M/V tethys II, M/V l`europe, and M/V sagitta III in area bound by…2023-07-20
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
56 survey operations listed in force · see all
Record snapshot 2026-10-02 17:16Z; 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.