Seismic survey in progress until further notice by M/V ramform challenger towing four mile long cable in…
South China Sea · HYDROPAC 154/01
What this record establishes
Archived notice · 2001-04-17 14:42Z
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 64/01 300808Z JAN 01; AUSCOAST 300716Z JAN 01. Issued 2001-01-30 10:20Z. 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
- Seismic survey in progress until further notice by M/V ramform challenger towing four mile long cable in…cancelled by this notice
- Dgps station at cape schanck light 38-30S 144-53E inoperativecancelled by this notice
- Seismic survey 19 apr until further notice by M/V ramform challenger towing three mile long cable in area…later cancellation notice
Current notices and reporting history in the South China Sea →
- issued
- 2001-01-30 10:20Z
- status
- Archived notice
- authority
- NAVAREA XI 64/01 300808Z JAN 01; AUSCOAST 300716Z JAN 01
- NAVAREA
- NAVAREA XI · named as the source of this relay
- sea
- South China Sea
- position
- 5.747, 113.689
- vessel
- M/V RAMFORM CHALLENGER · 110 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
1. SEISMIC SURVEY IN PROGRESS UNTIL FURTHER NOTICE BY M/V RAMFORM CHALLENGER TOWING FOUR MILE LONG CABLE IN AREA BOUND BY 05-47N 114-19E, 05-07N 113-39E, 05-42N 113-03E, 06-23N 113-45E. 2. CANCEL HYDROPAC 150/01(75), STATION RESTORED. 3. CANCEL HYDROPAC 1154/00.
Reading this warning
- Seismic survey
- A survey that maps the rock beneath the seabed with sound pulses from air guns, recorded on streamers kilometres long.
- 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 · cable & pipeline work
69 within 180 nm since 2000 · 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.
- Pipeline operations 25 may thru 23 jun by M/V rach dua along trackline joining 05-46.05N 111-47.69E,…2020-05-21
- Seismic survey in progress until 15 aug by M/V cgg amadeus towing seven 7000 meter long cables in area bound…2018-07-31
- Seismic survey in progress until 01 aug by M/V cgg amadeus towing seven 7000 meter long cables in area bound…2018-05-23
- Cable operations in progress until further notice by cableship rene descartes in vicinity of trackline…2017-02-22
- Cable operations 240200Z jan until further notice by cableship rene descartes in vicinity of trackline…2017-01-24
- Seismic survey in progress until further notice by M/V ramform sovereign towing 12 5.1 mile long cables in…2017-01-04
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
23 cable & pipeline work listed in force · see all
Record snapshot 2026-10-03 16:41Z; source collection times vary.
Cable ops
Cable laying, pipeline and seismic operations. All current cable & pipeline work →
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.