45 meter diameter towing pontoon with radar reflector and flashing white light adrift in vicinity 36-27S…
Great Australian Bight · HYDROPAC 516/21
What this record establishes
Archived notice · 2021-02-17 06:23Z
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 11/21 140555Z FEB 21.. Issued 2021-02-14 06:23Z. 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
- Great Australian Bight. The parsed report position is -36.450, 138.567. 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 Great Australian Bight →
- issued
- 2021-02-14 06:23Z
- status
- Archived notice
- self-cancels
- 2021-02-17 06:23Z
- authority
- SEA SAFETY 11/21 140555Z FEB 21.
- issued by
- SEA SAFETY
- sea
- Great Australian Bight
- position
- -36.450, 138.567
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
GREAT AUSTRALIAN BIGHT. AUSTRALIA-SOUTH COAST. DNC 05. 1. 45 METER DIAMETER TOWING PONTOON WITH RADAR REFLECTOR AND FLASHING WHITE LIGHT ADRIFT IN VICINITY 36-27S 138-34E AT 140530Z FEB. 2. CANCEL HYDROPAC 508/21. 3. CANCEL THIS MSG 170623Z FEB 21.
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.
- Tow / towing
- A vessel towing another vessel, a barge or a structure — slow, hard to manoeuvre, and with a long line between.
- 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.
- 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.
- 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.
- CANCEL THIS MSG
- The warning's own expiry: a line telling the reader when the message cancels itself.
Collected reports in this area · tows
2 within 180 nm since 2021 · 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
0 tows listed in force · see all
Record snapshot 2026-10-03 05:51Z; source collection times vary.
Towing
Vessels under tow with long or unlit tow lines. All current tows →
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.