Large navigation mark, red, adrift in 18-34.7S 117-20.2E at 162100UTC apr
Indian Ocean · HYDROPAC 1658/19
What this record establishes
Archived notice · 2019-05-19 23:56Z
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) · SEA SAFETY 74/19 162248Z MAY 19.. Issued 2019-05-16 23:56Z. 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
- Indian Ocean. The parsed report position is -18.578, 117.337. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
- issued
- 2019-05-16 23:56Z
- status
- Archived notice
- self-cancels
- 2019-05-19 23:56Z
- authority
- SEA SAFETY 74/19 162248Z MAY 19.
- issued by
- SEA SAFETY
- sea
- Indian Ocean
- position
- -18.578, 117.337
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
EASTERN INDIAN OCEAN. AUSTRALIA-NORTHWEST COAST. DNC 04. 1. LARGE NAVIGATION MARK, RED, ADRIFT IN 18-34.7S 117-20.2E AT 162100UTC APR. 2. CANCEL THIS MSG 192356Z MAY 19.
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.
- Adrift
- Loose and moving with wind and current — a vessel, container, buoy, log or anything else no longer secured.
- 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.
- CANCEL THIS MSG
- The warning's own expiry: a line telling the reader when the message cancels itself.
- 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 · other warnings
22 within 180 nm since 2000 · 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.
- Mooring buoy, fl w, in vicinity 20-16.32S 116-16.58E semi-sumerged2026-04-04
- Semi-submerged mooring lightbuoy fl.w in position 20-16.32S 116-16.58E2026-04-04
- 40 meter long hose adrift in vicinity 20-01.23S 115-55.53E at 100645Z aug2019-08-10
- Port hedland C1 light 19-59.5S 118-26.2E at reduced intensity2019-03-30
- 12 six meter yellow mooring buoys within one mile of 19-49.77S 115-39.48E2017-09-08
- Eight meter tree adrift in 16-20.01S 118-21.95E at 240335Z jun2017-06-24
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
21 other warnings listed in force · see all
Record snapshot 2026-10-02 22:10Z; source collection times vary.
Other
Everything the classifier did not place elsewhere. All current other warnings →
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.