Surveys

Survey operations 0800Z to 1500Z daily 04, 05, 17 and 18 mar in area bound by 35-32N 024-28E, 35-32N…

Aegean Sea · HYDROLANT 810/20

What this record establishes

Archived notice · 2020-03-18 16:00Z

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 322/20 021718Z MAR 20.. Issued 2020-03-02 17:44Z. 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 map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.

Current notices and reporting history in the Aegean Sea →

issued: 2020-03-02 17:44Z
status: Archived notice
self-cancels: 2020-03-18 16:00Z
authority: NAVAREA III 322/20 021718Z MAR 20.
NAVAREA: NAVAREA III · named as the source of this relay
sea: Aegean Sea
position: 35.482, 24.541
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. SURVEY OPERATIONS 0800Z TO 1500Z DAILY
   04, 05, 17 AND 18 MAR IN AREA BOUND BY
   35-32N 024-28E, 35-32N 024-38E,
   35-25N 024-38E, 35-27N 024-26E,
   35-31N 024-26E, 35-31N 024-28E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 181600Z MAR 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.
Survey operations: A research or survey vessel is mapping the seabed or water column, often while towing equipment.
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.
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.
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.

All warning terms →

Collected reports in this area · survey operations

175 within 180 nm since 2000 · 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

Missile operations 0530Z to sunset daily every wednesday thru saturday until 14 jun and 16 seb thru 31 dec…Missiles · 49.4 nm

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-10-04 02:37Z; 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.