St
Irish Sea and St. George's Channel · HYDROLANT 3598/18
What this record establishes
Archived notice · 2018-11-20 10:36Z
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) · WZ 1204/18 200845Z NOV 18.. Issued 2018-11-20 08:57Z. 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
- Irish Sea and St. George's Channel. The parsed report position is 52.800, -4.470. 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
- Cancel HYDROLANT 3598/18 and this msglater cancellation notice
Current notices and reporting history in the Irish Sea and St. George's Channel →
Activity windows · 1 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2018-11-20 12:00Z | 2018-11-21 00:01Z | — | 12 h 01 |
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2018-11-20 08:57Z
- status
- Archived notice
- self-cancels
- 2018-11-21 01:01Z
- authority
- WZ 1204/18 200845Z NOV 18.
- issued by
- WZ
- sea
- Irish Sea and St. George's Channel
- position
- 52.800, -4.470
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
CARDIGAN BAY. WALES. DNC 20. CHART 36002. 1. ST. TUDWAL'S WEST ISLAND LIGHT 52-48.0N 004-28.2W UNRELIABLE 201200Z TO 210001Z NOV. 2. CANCEL THIS MSG 210101Z NOV 18.
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.
- Chart reference
- The number of the nautical chart on which the reported position lies.
- 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.
- Inoperative / unreliable / off air
- An aid or radio service is not working as charted or published.
- 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.
- CANCEL THIS MSG
- The warning's own expiry: a line telling the reader when the message cancels itself.
Collected reports in this area · aids-to-navigation notices
1880 within 180 nm since 1997 · 5 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.
- Bull point light in 51-12.00N 004-12.10W unreliable2026-09-24
- Roker pier light 54-55.30N 001-21.20W unreliable2026-09-05
- Mew island light 54-41.90N 005-30.80W unreliable2026-08-11
- Mf dsc and r/t services off air at: a. bawdsey 51-59.60N 001-24.50E2026-08-01
- Fowey light 50-19.60N 004-38.90W unreliable2026-07-27
- NAVTEX station portpatrick (o) 54-50.63N 005-07.46W off air 020800Z to 031600Z oct2024-10-01
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
134 aids-to-navigation notices listed in force · see all
Record snapshot 2026-10-02 23:50Z; source collection times vary.
Nav aids
Lights extinguished, buoys off station, RACON/NAVTEX outages. All current aids-to-navigation notices →
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.