Underwater operations: a. in progress until 222359Z aug along trackline between 35-25.5N 002-48.6W and…
Alboran Sea · HYDROLANT 2667/18
What this record establishes
Archived notice · 2018-08-22 10:32Z
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 660/18 202306Z AUG 18.. Issued 2018-08-21 01:49Z. 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
- Alboran Sea. The parsed report position is 35.784, -3.640. 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 222359Z and 230800Z to 232359Z aug in 35-37.85N 004-29.55Wlater cancellation notice
Activity windows · 1 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2018-08-21 08:00Z | 2018-08-22 23:59Z | — | 39 h 59 |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2018-08-21 01:49Z
- status
- Archived notice
- self-cancels
- 2018-08-23 00:59Z
- authority
- NAVAREA III 660/18 202306Z AUG 18.
- NAVAREA
- NAVAREA III · named as the source of this relay
- sea
- Alboran Sea
- position
- 35.784, -3.640
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
WESTERN MEDITERRANEAN SEA.
ALBORAN SEA.
MOROCCO.
DNC 08.
1. UNDERWATER OPERATIONS:
A. IN PROGRESS UNTIL 222359Z AUG
ALONG TRACKLINE BETWEEN
35-25.5N 002-48.6W AND 36-18.7N 003-01.9W.
B. IN PROGRESS UNTIL 222359Z AUG WITHIN
AREA BOUND BY
35-59.8N 003-26.2W, 35-29.3N 003-40.0W,
35-39.4N 003-50.1W, 36-02.2N 003-37.1W.
C. 210800Z TO 222359Z ALONG TRACKLINE BETWEEN
35-54.2N 003-29.7W AND 35-46.3N 003-34.4W.
WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 230059Z AUG 18.
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.
- 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.
- 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.
- 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
78 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 06 feb by r/v maria s. merian in area bound by 35-45.00N 008-00.00W,…2024-01-29
- Survey operations 06 nov thru 17 by M/V ramon margalef in area bounded by: 36-00.00N 006-00.00W, 36-00.00N…2023-11-06
- Survey operations 06 nov thru 17 by M/V ramon margalef in area bounded by: 36-00.0N 006-00.0W, 36-00.0N…2023-11-03
- Survey operations in progress until 192300Z mar by M/V ramon margalef in area bound by: 35-48.0N 007-34.0W,…2023-03-14
- Survey operations in progress until further notice by M/V dar al beida in area bound by 36-00.00N…2023-02-20
- Survey operations in progress until further notice by M/V dar al beida in area bound by 36-10.00N…2023-02-20
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
55 survey operations listed in force · see all
Record snapshot 2026-10-02 09:01Z; 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.