Surveys

Survey operations 260001Z to 272259Z mar and 020332Z to 032359Z apr by M/V urania within 0.5 miles of: a.…

Tyrrhenian Sea · HYDROLANT 486/04

What this record establishes

Archived notice · 2004-04-04 00:59Z

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) · MARISICILIA 80/04 241400A MAR; MARISICILIA 81/04 241612A MAR. Issued 2004-03-25 11:40Z. 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: Tyrrhenian Sea. The parsed report position is 37.813, 14.586. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.

Current notices and reporting history in the Tyrrhenian Sea →

Activity windows · 2 in this warning

opens (UTC)	closes (UTC)	local	length
2004-03-26 00:01Z	2004-03-27 22:59Z	—	46 h 58
2004-04-02 03:32Z	2004-04-03 23:59Z	—	44 h 27

Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.

issued: 2004-03-25 11:40Z
status: Archived notice
self-cancels: 2004-04-04 00:59Z
authority: MARISICILIA 80/04 241400A MAR; MARISICILIA 81/04 241612A MAR
issued by: MARISICILIA
sea: Tyrrhenian Sea
position: 37.813, 14.586
vessel: M/V URANIA · 135 messages
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

1. SURVEY OPERATIONS 260001Z TO 272259Z MAR AND
   020332Z TO 032359Z APR BY M/V URANIA
   WITHIN 0.5 MILES OF:
   A. 38-01.808N 010-59.904E.
   B. 36-46.020N 013-17.461E.
   C. 37-11.000N 015-17.000E.
   D. 38-05.728N 015-36.269E.
   E. 38-07.777N 015-39.032E.
   F. 38-13.366N 015-36.329E.
   G. 38-15.766N 015-40.334E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 040059Z APR.

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.
Within a radius of: A circular area — every position within a stated distance of a point.
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.
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

271 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.

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

Submarine cable and rov works days 280000 UTC sep 26 to 071000 UTC oct 26 at points: 36-12.78N 015-52.58E…Cable ops · 111.9 nm

Worldwide in the collected sources

55 survey operations listed in force · see all

Record snapshot 2026-10-02 08:02Z; 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.