Underwater operations 01 thru 20 may, and 17 jun by c/s antonio meucci in area bound by 40-29.84N…
Sea of Marmara · HYDROLANT 1470/20
What this record establishes
Archived notice · 2020-04-30 14:03Z
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) · TURKEY 198/20 301136Z APR 20.. Issued 2020-04-30 11:57Z. 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 Marmara. 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
Current notices and reporting history in the Sea of Marmara →
- issued
- 2020-04-30 11:57Z
- status
- Archived notice
- authority
- TURKEY 198/20 301136Z APR 20.
- issued by
- TURKEY
- sea
- Sea of Marmara
- position
- 40.467, 26.905
- vessel
- C/S ANTONIO MEUCCI · 5 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
SEA OF MARMARA. DNC 09. 1. UNDERWATER OPERATIONS 01 THRU 20 MAY, AND 17 JUN BY C/S ANTONIO MEUCCI IN AREA BOUND BY 40-29.84N 026-56.39E, 40-27.84N 026-57.44E, 40-26.20N 026-52.30E, 40-28.23N 026-51.05E. 2. CANCEL THIS MSG 18 JUN 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.
- 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.
- 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
131 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.
- Survey operations in progress until 14 jun by M/V tcg cesme in areas bound by a. 38-55.93N 025-24.97E,…2022-05-28
- Survey operations in progress until 172059Z may by M/V oceanic vega, M/V mainport pine and M/V aquarius-g in…2021-04-08
- Survey operations 23 mar thru 15 apr by M/V tubitak marmara and M/V tubitak mam in area bound by 40-03.20N…2021-03-22
- Survey operations 18 feb thru 02 mar by M/V tcg cesme in area bound by 40-00.94N 024-52.91E, 39-40.83N…2021-02-16
- Underwater operations in progress until 19 nov by M/V aegaeo a. 15 nov in 39-53.48N 025-15.05E2020-11-15
- Survey operations in progress until 18 nov by M/V aegaeo a. 13 nov in area bound by 40-36.42N 022-54.25E,…2020-11-13
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 2026-10-03 00:46Z; 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.