Nav aids

GPS jamming exercises 0730Z to 1500Z daily 12 thru 30 jun in area within 22 miles of 54-50.0N 004-56.0W

Irish Sea and St. George's Channel · HYDROLANT 1258/23

What this record establishes

Archived notice · 2023-06-30 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 421/23 071001Z JUN 23.. Issued 2023-06-07 10:35Z. 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 · 19 in this warning

opens (UTC)	closes (UTC)	local	length
2023-06-12 07:30Z	2023-06-12 15:00Z	—	7 h 30
2023-06-13 07:30Z	2023-06-13 15:00Z	—	7 h 30
2023-06-14 07:30Z	2023-06-14 15:00Z	—	7 h 30
2023-06-15 07:30Z	2023-06-15 15:00Z	—	7 h 30
2023-06-16 07:30Z	2023-06-16 15:00Z	—	7 h 30
2023-06-17 07:30Z	2023-06-17 15:00Z	—	7 h 30
2023-06-18 07:30Z	2023-06-18 15:00Z	—	7 h 30
2023-06-19 07:30Z	2023-06-19 15:00Z	—	7 h 30
… 11 more

Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.

issued: 2023-06-07 10:35Z
status: Archived notice
self-cancels: 2023-06-30 16:00Z
authority: WZ 421/23 071001Z JUN 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.
SCOTLAND.
DNC 20.
1. GPS JAMMING EXERCISES 0730Z TO 1500Z DAILY
   12 THRU 30 JUN IN AREA WITHIN 22 MILES OF
   54-50.0N 004-56.0W.
   CONTACT MOD WEST FREUGH RANGE CONTROL,
   PHONE: 4417 7688 8932, 4417 7688 8930 FOR ADVICE.
2. CANCEL THIS MSG 301600Z JUN 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.

All warning terms →

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 20:21Z; 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.