Nav aids

GPS jamming exercises 0700Z to 1700Z daily 13 thru 22 may within ten miles of 54-48.7N 004-57.4W

Irish Sea and St. George's Channel · HYDROLANT 1138/15

What this record establishes

Archived notice · 2015-05-22 18:00Z

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 571/15 100240Z MAY 15.. Issued 2015-05-10 06:25Z. 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 54.812, -4.957 with a 10.0 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 · 10 in this warning

opens (UTC)	closes (UTC)	local	length
2015-05-13 07:00Z	2015-05-13 17:00Z	—	10 h
2015-05-14 07:00Z	2015-05-14 17:00Z	—	10 h
2015-05-15 07:00Z	2015-05-15 17:00Z	—	10 h
2015-05-16 07:00Z	2015-05-16 17:00Z	—	10 h
2015-05-17 07:00Z	2015-05-17 17:00Z	—	10 h
2015-05-18 07:00Z	2015-05-18 17:00Z	—	10 h
2015-05-19 07:00Z	2015-05-19 17:00Z	—	10 h
2015-05-20 07:00Z	2015-05-20 17:00Z	—	10 h
… 2 more

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

issued: 2015-05-10 06:25Z
status: Archived notice
self-cancels: 2015-05-22 18:00Z
authority: WZ 571/15 100240Z MAY 15.
issued by: WZ
sea: Irish Sea and St. George's Channel
position: 54.812, -4.957 · r 10.0 nm
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

SCOTLAND-SOUTHWEST COAST.
GPS SATELLITE SYSTEM.
DNC 20.
1. GPS JAMMING EXERCISES 0700Z TO 1700Z DAILY 13 THRU 22 MAY
   WITHIN TEN MILES OF 54-48.7N 004-57.4W. NAVIGATION
   PROHIBITED IN LUCE BAY DURING EXERCISES.
   CONTACT LUCE BAY CONTROL ON VHF CH 16 OR
   PHONE: 017 7688 8932 FOR ADVICE.
2. CANCEL THIS MSG 221800Z MAY 15.

Reading this warning

GNSS / GPS: Satellite positioning — GPS and other systems — and the testing, jamming and interference that make it unreliable in an area.
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.
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.
Navigation prohibited: Ships may not enter or pass through the area, or a port is closed to traffic.
VHF / channel 16: Very high frequency marine radio; channel 16 is the international distress, safety and calling channel.
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

2003 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 2026-10-03 09:28Z; 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.