Seismic survey is being conducted by vessel Ramform Sovereign towing twelve 10050-meter cables in Selat Makasar until further notice.
Makassar Strait · NAVAREA XI 34/26
What this record establishes
Listed in force
The latest collected record lists this warning as active. This is the status of the notice, not a live observation of conditions at the location.
- Source and dates
- Japan Coast Guard JHOD NAVAREA XI · Japan Coast Guard (JHOD). Issued 2026-01-27 09:00Z. First collected 2026-08-17 13:42Z; last seen in collection 2026-08-17 14:24Z. Collection dates record ingestion, not a new incident or a fresh field observation.
- Location covered
- Makassar Strait. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.
Current notices and reporting history in the Makassar Strait →
- issued
- 2026-01-27 09:00Z
- status
- Listed in force
- authority
- Japan Coast Guard (JHOD)
- NAVAREA
- NAVAREA XI
- issued by
- JAPAN COAST GUARD
- sea
- Makassar Strait
- position
- -0.730, 118.079
- vessel
- S/V RAMFORM SOVEREIGN · 63 messages
- nearest port
- Senipah · 55 nm
- source
- Japan Coast Guard JHOD NAVAREA XI · first seen 2026-08-17 13:42Z
Original warning text
SELAT MAKASAR. SEISMIC SURVEY WORKS BY S/V RAMFORM SOVEREIGN TOWING TWELVE CABLES, EACH 10050 METRE LONG. UNTIL FURTHER NOTICE. AREA BOUNDED BY 00-10.3S 117-49.0E 00-10.3S 117-50.2E 00-52.5S 117-50.2E 01-30.6S 117-26.9E 01-33.7S 117-31.8E 01-44.2S 117-25.4E 01-50.3S 117-36.3E 01-55.3S 117-45.7E 01-23.4S 118-03.7E 01-20.8S 117-59.4E 01-16.5S 118-00.7E 01-16.5S 118-08.6E 01-33.6S 118-08.6E 01-33.6S 118-33.5E 00-47.9S 118-33.7E 00-48.0S 118-27.7E 00-14.0N 118-28.0E 00-14.0N 118-10.1E 00-31.9N 118-10.1E 00-32.0N 117-47.8E.
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.
- Survey operations
- A research or survey vessel is mapping the seabed or water column, often while towing equipment.
- 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.
- Until further notice
- The operation or danger has no scheduled end; the warning stays in force until a later message cancels it.
- 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.
Conditions at the position · now
loading…
MET Norway · NOAA WaveWatch III · HYCOM · GEBCO 2020 · model data at the centroid, not an observation
Collected reports in this area · cable & pipeline work
18 within 180 nm since 2003 · 1 in the last 12 months · 1 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.
- Cable operations 17 aug until further notice by cableship ile de re in vicinity of trackline joining…2017-08-16
- Seismic survey in progress until 17 apr by M/V western monarch towing eight three mile long cables in area…2014-04-07
- Seismic survey in progress until 15 apr by M/V cgg amadeus towing eight 6000 meter long cables in area bound…2014-03-02
- Seismic survey in progress until 31 mar by M/V western monarch towing 12 four mile long cables in area bound…2014-01-23
- Seismic survey 190001Z may to 200001Z jun by M/V akademik fersman towing 9000 meter long cable in area bound…2012-05-14
- Seismic survey in progress until 15 nov by M/V orient explorer towing four two mile long cables in area…2011-10-15
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
Worldwide in the collected sources
24 cable & pipeline work listed in force · see all
Record snapshot 2026-10-01 05:30Z; 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.