Surveys

Survey operations in progress until 30 sep by M/V towing 8500 meter long cable in area bound by 34-13-04N…

Yellow Sea · HYDROPAC 2348/12

What this record establishes

Archived notice · 2012-10-01 00:01Z

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 XI 552/12 171009Z AUG 12 - AUSCOAST 224/12 171048Z AUG 12.. Issued 2012-08-17 11:29Z. 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
Yellow 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 Yellow Sea →

issued
2012-08-17 11:29Z
status
Archived notice
authority
NAVAREA XI 552/12 171009Z AUG 12 - AUSCOAST 224/12 171048Z AUG 12.
NAVAREA
NAVAREA XI · named as the source of this relay
sea
Yellow Sea
position
34.283, 121.323
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

YELLOW SEA.
1. SURVEY OPERATIONS IN PROGRESS UNTIL 30 SEP
   BY M/V TOWING 8500 METER LONG CABLE
   IN AREA BOUND BY
   34-13-04N 120-19-33E, 34-50-34N 121-56-11E,
   34-18-42N 122-11-34E, 33-45-00N 120-55-00E.
2. CANCEL HYDROPAC 2340/12(74,75).
3. CANCEL THIS MSG 01 OCT 12.

Reading this warning

Survey operations
A research or survey vessel is mapping the seabed or water column, often while towing equipment.
Towed array / streamer
Equipment towed a long way behind a vessel — sonar, a hydrophone cable, a sampling sled — invisible at the surface.
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.
Cancellation reference
A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
HYDROPAC
The U.S. long-range warning series for the Pacific outside NAVAREA XII and for the Indian Ocean, Persian Gulf 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

6 within 180 nm since 2001 · 0 in the last 12 months · 0 listed in force now

01
05
10
15

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 09:10Z; 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.