Underwater operations in progress until further notice by M/V filia: a. along trackline joining 39-24.6N…
Aegean Sea · HYDROLANT 1988/20
What this record establishes
Archived notice · 2020-06-24 13:04Z
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 922/20 181212Z JUN 20.. Issued 2020-06-18 12:17Z. 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
- Aegean Sea. The parsed report position is 40.701, 25.295. 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
- Underwater operations in progress until 20 jun by M/V filia along tracklines joining: a. 39-24.6N 025-04.1E,…cancelled by this notice
- Cancel HYDROLANT 1988/20 and this msglater cancellation notice
- issued
- 2020-06-18 12:17Z
- status
- Archived notice
- authority
- NAVAREA III 922/20 181212Z JUN 20.
- NAVAREA
- NAVAREA III · named as the source of this relay
- sea
- Aegean Sea
- position
- 40.701, 25.295
- vessel
- M/V FILIA · 4 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
AEGEAN SEA.
DNC 09.
1. UNDERWATER OPERATIONS IN PROGRESS UNTIL
FURTHER NOTICE BY M/V FILIA:
A. ALONG TRACKLINE JOINING
39-24.6N 025-04.1E, 39-44.7N 025-03.6E.
B. ALONG TRACKLINE JOINING
39-45.0N 025-30.0E, 40-01.0N 025-31.0E.
C. ALONG TRACKLINE JOINING
40-19.5N 025-16.9E, 40-54.2N 025-17.1E.
D. IN AREA BOUND BY
40-36.4N 024-50.3E, 40-52.0N 024-50.5E,
40-50.2N 025-42.5E, 40-30.1N 025-43.1E.
WIDE BERTH REQUESTED.
2. CANCEL HYDROLANT 1971/20.
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.
- Until further notice
- The operation or danger has no scheduled end; the warning stays in force until a later message cancels it.
- 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.
- Area bound by
- Introduces a list of positions that are the corners of an area — the polygon the warning applies to.
- 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.
Collected reports in this area · survey operations
114 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 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
- Underwater operations in progress until 30 nov by M/V detek salvor in position 41-01.3N 029-00.0E2020-11-05
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
Worldwide in the collected sources
56 survey operations listed in force · see all
Record snapshot 2026-10-03 22:35Z; 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.