Surveys

Siesmic survey in progress until 30 oct by M/V nan hai 502 in area bound by 08-55N 117-00E, 08-55N 112-45E,…

South China Sea · HYDROPAC 1544/05

What this record establishes

Archived notice · 2005-10-25 11:08Z

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 459/05 21 SEP 05.. Issued 2005-09-21 08:24Z. 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
2005-09-21 08:24Z
status
Archived notice
authority
NAVAREA XI 459/05 21 SEP 05.
NAVAREA
NAVAREA XI · named as the source of this relay
sea
South China Sea
position
10.361, 115.675
vessel
M/V NAN HAI 502 · 14 messages
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

1. SIESMIC SURVEY IN PROGRESS UNTIL 30 OCT BY
   M/V NAN HAI 502 IN AREA BOUND BY
   08-55N 117-00E,
   08-55N 112-45E,
   09-50N 112-54E,
   09-50N 113-57E,
   11-10N 113-57E,
   11-10N 114-32E,
   11-56N 114-32E,
   11-56N 118-00E,
   10-52N 118-00E.
   FIVE MILE BERTH REQUESTED.
2. CANCEL THIS MSG 31 OCT.

Reading this warning

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

2 within 180 nm since 2005 · 0 in the last 12 months · 0 listed in force now

05
10
14

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 2026-10-02 00:09Z; 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.