Surveys

Survey operations 22 jan thru 20 feb along trackline between 41-01.1N 028-59.3E and 41-01.4N 029-00.2E

Sea of Marmara · HYDROLANT 121/03

What this record establishes

Archived notice · 2003-02-21 00:00Z

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 III 34/03 171201Z JAN 03. Issued 2003-01-17 12:25Z. 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 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 Sea of Marmara →

issued: 2003-01-17 12:25Z
status: Archived notice
authority: NAVAREA III 34/03 171201Z JAN 03
NAVAREA: NAVAREA III · named as the source of this relay
sea: Sea of Marmara
position: 41.021, 28.996
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

1. SURVEY OPERATIONS 22 JAN THRU 20 FEB
   ALONG TRACKLINE BETWEEN
   41-01.1N 028-59.3E AND 41-01.4N 029-00.2E.
2. CANCEL THIS MSG 21 FEB.

Reading this warning

Survey operations: A research or survey vessel is mapping the seabed or water column, often while towing equipment.
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.
CANCEL THIS MSG: The warning's own expiry: a line telling the reader when the message cancels itself.

All warning terms →

Collected reports in this area · survey operations

142 within 180 nm since 1999 · 9 in the last 12 months · 5 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.

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

Drilling operations by fatih platform (imo 9503770Surveys · 87.2 nm

Worldwide in the collected sources

54 survey operations listed in force · see all

Record snapshot 2026-10-02 12:10Z; 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.