Hydrographic survey in progress until 190500Z feb by M/V alliance between 40-38N 018-35E and 40-59N 018-05E…
Adriatic Sea · HYDROLANT 353/99
What this record establishes
Archived notice · 1999-02-19 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). Issued 1999-02-18 22:36Z. 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
- Adriatic Sea. The map shows the reported line or operation extent; it is not a vessel track. Check the original wording for limits and qualifications.
Related notices and cancellation links
- issued
- 1999-02-18 22:36Z
- status
- Archived notice
- self-cancels
- 1999-02-19 06:00Z
- sea
- Adriatic Sea
- position
- 40.808, 18.333
- vessel
- M/V ALLIANCE · 61 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
1. HYDROGRAPHIC SURVEY IN PROGRESS UNTIL 190500Z FEB BY M/V ALLIANCE BETWEEN 40-38N 018-35E AND 40-59N 018-05E ALONG THE 200 METER CONTOUR. WIDE BERTH REQUESTED. 2. CANCEL HYDROLANT 350/99. 3. CANCEL THIS MSG 190600Z FEB.
Reading this warning
- Survey operations
- A research or survey vessel is mapping the seabed or water column, often while towing equipment.
- 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.
- 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.
- Cancellation reference
- A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
- HYDROLANT
- The U.S. long-range warning series for Atlantic waters outside NAVAREA IV, including the eastern Atlantic, the Mediterranean and adjoining seas.
- 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
71 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 28 aug thru 03 sep by M/V janus II in area bound by 40-58.27N 018-47.52E, 40-48.67N…2023-08-27
- Underwater operations 28 aug thru 03 sep in area bound by 40-58.27N 018-47.52E, 40-48.67N 018-24.72E,…2023-08-25
- Underwater operations in progress until 07 jan by M/V edda flora with submersible along trackline joining…2022-01-04
- Underwater operations 22 thru 31 dec by M/V edda flora with submersible along trackline joining 40-19.0N…2021-12-21
- Survey operations by M/V aigaio: a. 090900Z to 091400Z sep in 39-58.10N 019-23.83E2020-09-07
- Survey operations 07 nov thru 31 dec by M/V polar empress towing one five mile long cable in area bound by…2018-11-02
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
56 survey operations listed in force · see all
Record snapshot 2026-10-03 22:14Z; 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.