Nav aids

GPS jamming exercises 0730Z to 1600Z daily 21 mar thru 15 apr in area within 70 miles of 54-50N 004-56W

Irish Sea and St. George's Channel · HYDROLANT 809/22

What this record establishes

Archived notice · 2022-04-15 17:00Z

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 378/22 210012Z MAR 22.. Issued 2022-03-21 01:07Z. 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 70.0 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 · 26 in this warning

opens (UTC)closes (UTC)locallength
2022-03-21 07:30Z2022-03-21 16:00Z—8 h 30
2022-03-22 07:30Z2022-03-22 16:00Z—8 h 30
2022-03-23 07:30Z2022-03-23 16:00Z—8 h 30
2022-03-24 07:30Z2022-03-24 16:00Z—8 h 30
2022-03-25 07:30Z2022-03-25 16:00Z—8 h 30
2022-03-26 07:30Z2022-03-26 16:00Z—8 h 30
2022-03-27 07:30Z2022-03-27 16:00Z—8 h 30
2022-03-28 07:30Z2022-03-28 16:00Z—8 h 30
… 18 more

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

issued
2022-03-21 01:07Z
status
Archived notice
self-cancels
2022-04-15 17:00Z
authority
WZ 378/22 210012Z MAR 22.
issued by
WZ
sea
Irish Sea and St. George's Channel
position
54.833, -4.933 · r 70.0 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 19, DNC 20.
1. GPS JAMMING EXERCISES 0730Z TO 1600Z DAILY
   21 MAR THRU 15 APR IN AREA WITHIN 70 MILES OF
   54-50N 004-56W.
2. CANCEL THIS MSG 151700Z APR 22.

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

98
00
05
10
15
20
25
26

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

J
F
M
A
M
J
J
A
S
O
N
D

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 20:56Z; 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.