Surveys

Survey operations in progress until 31 jan 20 by M/V ramform hyperion towing 16 8100 meter long cables in…

South China Sea · HYDROPAC 2504/19

What this record establishes

Archived notice · 2019-10-19 23:34Z

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 426/19 050503Z AUG 19.. Issued 2019-08-05 09:02Z. 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
South China 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 South China Sea →

issued
2019-08-05 09:02Z
status
Archived notice
authority
NAVAREA XI 426/19 050503Z AUG 19.
NAVAREA
NAVAREA XI · named as the source of this relay
sea
South China Sea
position
6.638, 115.225
vessel
M/V RAMFORM HYPERION · 32 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

SOUTH CHINA SEA.
MALAYSIA.
DNC 11.
1. SURVEY OPERATIONS IN PROGRESS UNTIL 31 JAN 20
   BY M/V RAMFORM HYPERION TOWING 16 8100 METER
   LONG CABLES IN AREA BOUND BY
   07-38.55N 116-38.09E, 07-27.37N 116-32.40E,
   07-27.34N 116-21.38E, 06-37.13N 115-33.08E,
   06-32.14N 115-37.57E, 05-49.40N 114-56.04E,
   05-54.06N 114-51.49E, 05-40.38N 114-38.57E,
   06-00.19N 114-20.05E, 06-08.27N 114-28.08E,
   06-17.09N 114-19.54E, 06-22.08N 114-24.47E,
   06-27.03N 114-20.02E, 06-52.53N 114-46.16E,
   06-48.39N 114-50.40E, 07-04.50N 115-06.29E,
   06-51.21N 115-19.27E, 07-38.57N 116-05.57E.
   WIDE BERTH REQUESTED.
2. CANCEL THIS MSG 01 FEB 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.
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.
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

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

99
00
05
10
15
20
23

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 2026-10-01 20:26Z; 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.