Incidents · aircraft

Distress signal received on 406 mhz in 18-18.81N 107-05.80E

South China Sea · HYDROPAC 2709/16

What this record establishes

Archived notice · 2016-09-11 09:55Z

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) · MRCC HONG KONG 070944Z SEP 16 - JRCC AUSTRALIA 5470/16 CX 071024Z SEP 16.. Issued 2016-09-07 11:10Z. 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 parsed report position is 18.314, 107.097. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.

Original warning text

SOUTH CHINA SEA.
GULF OF TONKIN.
VIETNAM.
DNC 23.
1. DISTRESS SIGNAL RECEIVED ON 406 MHZ IN
   18-18.81N 107-05.80E. VESSELS IN VICINITY
   REQUESTED TO KEEP A SHARP LOOKOUT, ASSIST
   IF POSSIBLE. REPORTS TO MRCC HONG KONG,
   PHONE: 852 2233 7999,
   E-MAIL: HKMRCC@MARDEP.GOV.HK.
2. CANCEL HYDROPAC 2708/16(75), AIRCRAFT LOCATED SAFE.

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.
Distress signal received: A rescue centre has received an alert — from a beacon, a radio call or a satellite terminal — and is asking ships to look.
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.
Keep a sharp lookout: A request to every ship in the area to watch for the vessel, people or object described.
Assist if possible: The second half of the standard rescue request: ships able to help are asked to do so.
MRCC (Maritime Rescue Coordination Centre): A rescue coordination centre for maritime cases only, such as MRCC Fort-de-France or MRCC Vietnam.
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.

All warning terms →

Collected reports in this area · distress & casualty cases (archived)

707 within 180 nm since 1999 · 2 in the last 12 months · 0 listed in force now

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

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

0 distress & casualty cases (archived) listed in force · see all

Record snapshot 2026-10-02 12:59Z; source collection times vary.

Incidents

Search-and-rescue broadcasts, published only once a case has been closed for 30 days: groundings, sinkings, capsizes, fires, man overboard, overdue vessels. Nothing here is live. All current distress & casualty cases (archived) →

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.