Nav aids

Dgps station at st mathieu light 48-19.8N 004-46.3W: a. off air 300700Z to 301500Z aug

Celtic Sea · HYDROLANT 2354/01

What this record establishes

Archived notice · 2001-08-30 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) · NAVAREA II 318/01 271315Z AUG 01; NAVAREA III 426/01 AOR-E EGC #381 271548Z AUG 01. Issued 2001-08-27 17:38Z. 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
Celtic Sea. The parsed report position is 48.330, -4.772. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.

Related notices and cancellation links

Current notices and reporting history in the Celtic Sea →

Activity windows · 1 in this warning

opens (UTC)closes (UTC)locallength
2001-08-30 07:00Z2001-08-30 15:00Z—8 h

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

issued
2001-08-27 17:38Z
status
Archived notice
self-cancels
2001-08-30 16:00Z
authority
NAVAREA II 318/01 271315Z AUG 01; NAVAREA III 426/01 AOR-E EGC #381 271548Z AUG 01
NAVAREA
NAVAREA II · named as the source of this relay
sea
Celtic Sea
position
48.330, -4.772
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

CHART 37320 (16TH ED).
1. DGPS STATION AT ST MATHIEU LIGHT 48-19.8N 004-46.3W:
   A. OFF AIR 300700Z TO 301500Z AUG.
   B. CHANGED TO: 310.5 KHZ.
2. CANCEL HYDROLANT 2298/01(53).
3. CANCEL THIS MSG 301600Z AUG.

Reading this warning

Chart reference
The number of the nautical chart on which the reported position lies.
GNSS / GPS
Satellite positioning — GPS and other systems — and the testing, jamming and interference that make it unreliable in an area.
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.
Inoperative / unreliable / off air
An aid or radio service is not working as charted or published.
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.
Cancellation reference
A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
HYDROLANT
The U.S. long-range warning series for Atlantic waters outside NAVAREA IV, including the eastern Atlantic, the Mediterranean and adjoining seas.
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

805 within 180 nm since 1997 · 4 in the last 12 months · 0 listed in force now

97
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 2026-10-03 11:45Z; 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.