Surveys

Hydrographic survey 29 sep thru 02 oct by M/V geo surveyor towing equipment within 2000 meters of trackline…

Tyrrhenian Sea · HYDROLANT 3326/00

What this record establishes

Archived notice · 2000-09-28 17:14Z

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) · MARIDIPART LASPEZIA 168/00 271125Z SEP 00; PHON CON W/CTF 69. Issued 2000-09-27 21:13Z. 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 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 Tyrrhenian Sea →

issued
2000-09-27 21:13Z
status
Archived notice
authority
MARIDIPART LASPEZIA 168/00 271125Z SEP 00; PHON CON W/CTF 69
issued by
MARIDIPART LASPEZIA
sea
Tyrrhenian Sea
position
41.476, 12.376
vessel
M/V GEO SURVEYOR · 70 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

1. HYDROGRAPHIC SURVEY 29 SEP THRU 02 OCT BY M/V GEO SURVEYOR
   TOWING EQUIPMENT WITHIN 2000 METERS OF TRACKLINE JOINING
   41-15.5N 012-11.7E, 41-21.3N 012-14.7E, 41-21.2N 012-22.0E,
   41-34.8N 012-23.0E.
2. CANCEL HYDROLANT 3324/00.
3. CANCEL THIS MSG 03 OCT.

Reading this warning

Survey operations
A research or survey vessel is mapping the seabed or water column, often while towing equipment.
Tow / towing
A vessel towing another vessel, a barge or a structure — slow, hard to manoeuvre, and with a long line between.
Within a radius of
A circular area — every position within a stated distance of a point.
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.
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.
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

107 within 180 nm since 1997 · 0 in the last 12 months · 0 listed in force now

97
00
05
10
15
20
24

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

No other collected notice is currently listed in force within this radius. This does not establish safe conditions.

Worldwide in the collected sources

56 survey operations listed in force · see all

Record snapshot 2026-10-03 14:28Z; 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.