Surveys

Survey operations 15 jul until further notice by M/V thetis towing equipment in area bound by 37-15.55N…

Ionian Sea · HYDROLANT 1184/04

What this record establishes

Archived notice · 2004-07-31 12:28Z

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) · MARISICLIA 281/04 131010B JUL 04, NAVAREA VI 200/04 140200Z JUL 04.. Issued 2004-07-14 05:01Z. 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 map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.

Related notices and cancellation links

Current notices and reporting history in the Ionian Sea →

issued
2004-07-14 05:01Z
status
Archived notice
authority
MARISICLIA 281/04 131010B JUL 04, NAVAREA VI 200/04 140200Z JUL 04.
NAVAREA
NAVAREA VI · named as the source of this relay
issued by
MARISICLIA
sea
Ionian Sea
position
37.174, 15.288
vessel
M/V THETIS · 20 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

1. SURVEY OPERATIONS 15 JUL UNTIL FURTHER NOTICE
   BY M/V THETIS TOWING EQUIPMENT IN AREA BOUND BY
   37-15.55N 015-14.65E, 37-14.70N 015-15.75E,
   37-14.10N 015-15.90E, 37-13.75N 015-14.00E,
   37-11.35N 015-14.10E, 37-10.03N 015-12.60E,
   37-09.70N 015-13.50E, 37-10.05N 015-14.30E,
   37-08.87N 015-14.95E, 37-08.70N 015-13.80E,
   37-08.00N 015-13.60E, 37-08.00N 015-14.65E,
   37-06.57N 015-16.15E, 37-06.80N 015-17.35E,
   37-06.50N 015-17.95E, 37-05.55N 015-18.18E,
   37-05.50N 015-20.60E, 37-10.90N 015-20.60E,
   37-15.55N 015-18.00E. ONE MILE BERTH REQUESTED.
2. CANCEL HYDROLANT 1173/04(23).

Reading this warning

Survey operations
A research or survey vessel is mapping the seabed or water column, often while towing equipment.
Until further notice
The operation or danger has no scheduled end; the warning stays in force until a later message cancels it.
Tow / towing
A vessel towing another vessel, a barge or a structure — slow, hard to manoeuvre, and with a long line between.
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.
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.

All warning terms →

Collected reports in this area · survey operations

250 within 180 nm since 1999 · 0 in the last 12 months · 0 listed in force now

99
00
05
10
15
20
22

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

J
F
M
A
M
J
J
A
S
O
N
D

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

55 survey operations listed in force · see all

Record snapshot 2026-10-02 06:59Z; 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.