Nga chart 93036 (10TH ed)
South China Sea · HYDROPAC 383/08
What this record establishes
Archived notice · 2008-03-09 09:57Z
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 84/08 28 FEB 08.. Issued 2008-02-28 14:44Z. 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 16.635, 113.800 with a 0.0 nm radius. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
Related notices and cancellation links
Current notices and reporting history in the South China Sea →
- issued
- 2008-02-28 14:44Z
- status
- Archived notice
- authority
- NAVAREA XI 84/08 28 FEB 08.
- NAVAREA
- NAVAREA XI · named as the source of this relay
- sea
- South China Sea
- position
- 16.635, 113.800 · r 0.0 nm
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
NGA CHART 93036 (10TH ED). DISCOLORED WATER REPORTED WITHIN 30 METERS OF 16-38.1N 113-48.0E AT 280700Z FEB.
Reading this warning
- Chart reference
- The number of the nautical chart on which the reported position lies.
- Discoloured water
- Patches of unusually coloured sea — often a sign of a submarine volcano or of a shoal.
- Within a radius of
- A circular area — every position within a stated distance of a point.
- 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.
- Date-time group (DTG)
- A compact UTC timestamp — day, hour and minute followed by Z — such as 201500Z for the 20th at 15:00 UTC.
Collected reports in this area · volcanic activity
1 within 180 nm since 2008 · 0 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
12 volcanic activity listed in force · see all
Record snapshot 2026-10-01 19:43Z; source collection times vary.
Volcanic
Submarine eruptions, discoloured water, pumice rafts. All current volcanic activity →
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.