GPS jamming exercises 0830Z to 1600Z daily 20 thru 25 mar and 0730Z to 1500Z daily 26 thru 31 mar in areas…
Irish Sea and St. George's Channel · HYDROLANT 569/23
What this record establishes
Archived notice · 2023-03-31 16:00Z
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 194/23 151801Z MAR 23.. Issued 2023-03-15 18:43Z. 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 54.833, -4.933 with a 22.0 nm radius. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
Current notices and reporting history in the Irish Sea and St. George's Channel →
Activity windows · 12 in this warning
| opens (UTC) | closes (UTC) | local | length |
|---|---|---|---|
| 2023-03-20 08:30Z | 2023-03-20 16:00Z | — | 7 h 30 |
| 2023-03-21 08:30Z | 2023-03-21 16:00Z | — | 7 h 30 |
| 2023-03-22 08:30Z | 2023-03-22 16:00Z | — | 7 h 30 |
| 2023-03-23 08:30Z | 2023-03-23 16:00Z | — | 7 h 30 |
| 2023-03-24 08:30Z | 2023-03-24 16:00Z | — | 7 h 30 |
| 2023-03-25 08:30Z | 2023-03-25 16:00Z | — | 7 h 30 |
| 2023-03-26 07:30Z | 2023-03-26 15:00Z | — | 7 h 30 |
| 2023-03-27 07:30Z | 2023-03-27 15:00Z | — | 7 h 30 |
| … 4 more | |||
Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.
- issued
- 2023-03-15 18:43Z
- status
- Archived notice
- self-cancels
- 2023-03-31 16:00Z
- authority
- WZ 194/23 151801Z MAR 23.
- issued by
- WZ
- sea
- Irish Sea and St. George's Channel
- position
- 54.833, -4.933 · r 22.0 nm
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
IRISH SEA. NORTH CHANNEL. SCOTLAND. DNC 20. 1. GPS JAMMING EXERCISES 0830Z TO 1600Z DAILY 20 THRU 25 MAR AND 0730Z TO 1500Z DAILY 26 THRU 31 MAR IN AREAS WITHIN 22 MILES OF 54-50N 004-56W. 2. CANCEL THIS MSG 311600Z MAR 23.
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.
- GNSS / GPS
- Satellite positioning — GPS and other systems — and the testing, jamming and interference that make it unreliable in an area.
- Within a radius of
- A circular area — every position within a stated distance of a point.
- 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 · aids-to-navigation notices
2008 within 180 nm since 1998 · 9 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.
- Dubh artach light 56-08.0N 006-38.1W unreliable2026-09-17
- Dubh artach light 56-08.00N 006-38.10W unreliable2026-09-16
- Roker pier light 54-55.30N 001-21.20W unreliable2026-09-05
- RACON at hyskeir light 56-58.20N 006-40.80W inoperative2026-08-28
- Mf dsc and r/t services off air at: a. cullercoats 55-04.40N 001-27.80W2026-08-24
- Mf dsc and r/t services off air at: a. cullercoats 55-04.40N 001-27.80W2026-08-16
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 20:20Z; 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.