Surveys

Survey operations by M/V miss marilene tide: a. 080600Z to 182359Z apr in area 36-17.8N 015-58.7E

Ionian Sea · HYDROLANT 956/21

What this record establishes

Archived notice · 2021-04-24 01:00Z

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) · NAVAREA III 354/21 080015Z APR 21.. Issued 2021-04-08 00:46Z. 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: Ionian Sea. The parsed report position is 36.898, 15.681. 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 Ionian Sea →

Activity windows · 2 in this warning

opens (UTC)	closes (UTC)	local	length
2021-04-08 06:00Z	2021-04-18 23:59Z	—	257 h 59
2021-04-16 00:01Z	2021-04-23 23:59Z	—	191 h 58

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

issued: 2021-04-08 00:46Z
status: Archived notice
self-cancels: 2021-04-24 01:00Z
authority: NAVAREA III 354/21 080015Z APR 21.
NAVAREA: NAVAREA III · named as the source of this relay
sea: Ionian Sea
position: 36.898, 15.681
vessel: M/V MISS MARILENE TIDE
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

EASTERN MEDITERRANEAN SEA.
IONIAN SEA.
SICILY.
DNC 09.
1. SURVEY OPERATIONS BY M/V MISS MARILENE TIDE:
   A. 080600Z TO 182359Z APR
      IN AREA 36-17.8N 015-58.7E.
   B. 160001Z TO 232359Z APR
      IN AREA 37-30.0N 015-23.0E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 240100Z APR 21.

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.
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.
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

225 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 · 40.6 nm

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-10-01 14:26Z; 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.