Underwater sonar operations 250700Z to 251800Z mar by M/V manning in area bound by 44-11N 009-31E, 44-14N…
Ligurian Sea · HYDROLANT 568/99
What this record establishes
Archived notice · 1999-03-25 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 1999-03-23 14:24Z. 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
- Ligurian Sea. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.
Activity windows · 1 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 1999-03-25 07:00Z | 1999-03-25 18:00Z | — | 11 h |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 1999-03-23 14:24Z
- status
- Archived notice
- self-cancels
- 1999-03-25 19:00Z
- sea
- Ligurian Sea
- position
- 44.178, 9.419
- vessel
- M/V MANNING · 22 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
1. UNDERWATER SONAR OPERATIONS 250700Z TO 251800Z MAR BY M/V MANNING IN AREA BOUND BY 44-11N 009-31E, 44-14N 009-22E, 44-11N 009-19E, 44-07N 009-28E. 2. CANCEL THIS MSG 251900Z MAR.
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.
- 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 · other warnings
58 within 180 nm since 1996 · 1 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.
- Resourseful platform up to 312359 UTC AUG26 in position 44-31.60N 012-30.60E 3. maximum height above sea…2026-03-02
- Bombing exercises 1300Z to 1600Z 23 and 24 feb in area bound by 42-10.0N 006-40.0E, 42-10.0N 007-46.5E,…2021-02-20
- Eight meter long tree trunk adrift in 43-02.8N 007-49.2E at 121241Z mar2020-03-12
- Clean up operations in progress until further notice in area within ten miles of 43-14.9N 009-28.7E2018-10-11
- Mine clearing operations 231000Z to 241000Z apr by M/V HMS enterprise, M/V esps segura, M/V tgc anamur and…2018-04-19
- Red flare sighted in 43-29N 009-24E at 191900Z feb2015-02-19
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
23 other warnings listed in force · see all
Record snapshot 2026-10-02 03:01Z; source collection times vary.
Other
Everything the classifier did not place elsewhere. All current other warnings →
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.