Nav aids

GPS satellite system

Inner Seas off the West Coast of Scotland · HYDROLANT 602/11

What this record establishes

Archived notice · 2011-04-13 00:59Z

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 400/11 110956Z APR 11.. Issued 2011-04-11 10:29Z. 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: Inner Seas off the West Coast of Scotland. The parsed report position is 57.867, -5.683 with a 35.0 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 Inner Seas off the West Coast of Scotland →

Activity windows · 2 in this warning

opens (UTC)	closes (UTC)	local	length
2011-04-12 08:00Z	2011-04-12 10:00Z	—	2 h
2011-04-12 22:00Z	2011-04-12 23:59Z	—	1 h 59

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

issued: 2011-04-11 10:29Z
status: Archived notice
self-cancels: 2011-04-13 00:59Z
authority: WZ 400/11 110956Z APR 11.
issued by: WZ
sea: Inner Seas off the West Coast of Scotland
position: 57.867, -5.683 · r 35.0 nm
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

SCOTLAND-WEST COAST.
NORTH MINCH.
GPS SATELLITE SYSTEM.
1. GPS JAMMING EXERCISES 120800Z TO 121000Z
   AND 122200Z TO 122359Z APR WITHIN
   35 MILES OF 57-52N 005-41W.
2. CANCEL THIS MSG 130059Z APR.

Reading this warning

GNSS / GPS: Satellite positioning — GPS and other systems — and the testing, jamming and interference that make it unreliable in an area.
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.
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.

All warning terms →

Collected reports in this area · aids-to-navigation notices

1905 within 180 nm since 1998 · 7 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
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
Mf dsc service off air at tiree 56-30.20N 006-57.80W2026-08-08

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 09:08Z; 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.