Survey operations in progress until further notice by M/V pgs apollo towing ten five mile long cables in…
South China Sea · HYDROPAC 2903/17
What this record establishes
Archived notice · 2017-08-27 11:19Z
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 535/17 261444Z AUG 17.. Issued 2017-08-26 14:50Z. 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
- 2017-08-26 14:50Z
- status
- Archived notice
- authority
- NAVAREA XI 535/17 261444Z AUG 17.
- NAVAREA
- NAVAREA XI · named as the source of this relay
- sea
- South China Sea
- position
- 21.785, 119.946
- vessel
- M/V PGS APOLLO · 81 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
SOUTH CHINA SEA. TAIWAN STRAIT. TAIWAN. DNC 23. 1. SURVEY OPERATIONS IN PROGRESS UNTIL FURTHER NOTICE BY M/V PGS APOLLO TOWING TEN FIVE MILE LONG CABLES IN AREA BOUND BY 22-12N 119-23E 22-12N 120-18E 21-15N 120-35E 21-34N 119-23E. 2. CANCEL HYDROPAC 2824/17(91,93,94).
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.
- Until further notice
- The operation or danger has no scheduled end; the warning stays in force until a later message cancels it.
- 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.
Collected reports in this area · survey operations
31 within 180 nm since 2017 · 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.
- Underwater operations in progress until 111200Z aug by M/V aniek in area bound by 21-37N 119-36E, 21-41N…2019-08-10
- Underwater operations in progress until 10 aug by M/V aniek in area bound by 21-37N 119-36E, 21-41N 119-32E,…2019-08-08
- Survey operations in progress until 14 sep by M/V sw vespucci towing five mile long cable in area bound by…2019-08-05
- Underwater operations 04 thru 08 aug by M/V aniek in area bound by 21-37N 119-36E, 21-41N 119-32E, 21-58N…2019-08-03
- Survey operations in progress until 15 dec by vessel towing 5000 meter long cable in area bound by 22-33-24N…2017-11-03
- Survey operations in progress until 31 oct by vessel towing 5000 meter long cable in area bound by 22-33-24N…2017-10-18
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
56 survey operations listed in force · see all
Record snapshot 2026-10-03 01:19Z; 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.