Nav aids

GPS unreliable until 252359Z dec within 20 miles of 44-15N 037-47E

Black Sea · HYDROLANT 3374/16

What this record establishes

Archived notice · 2016-12-26 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) · NAVAREA III 733/16 141958Z DEC 16.. Issued 2016-12-14 20:08Z. 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: Black Sea. The parsed report position is 44.250, 37.783 with a 20.0 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 Black Sea →

issued: 2016-12-14 20:08Z
status: Archived notice
self-cancels: 2016-12-26 00:59Z
authority: NAVAREA III 733/16 141958Z DEC 16.
NAVAREA: NAVAREA III · named as the source of this relay
sea: Black Sea
position: 44.250, 37.783 · r 20.0 nm
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

BLACK SEA.
RUSSIA.
GPS SATELLITE SYSTEM.
DNC 10.
1. GPS UNRELIABLE UNTIL 252359Z DEC
   WITHIN 20 MILES OF 44-15N 037-47E.
2. CANCEL THIS MSG 260059Z DEC 16.

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.
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.
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

6 within 180 nm since 2004 · 0 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.

A maritime incident has been reported in the black sea in vicinity 44-15.7N 037-32.9E at 220710Z jun 172017-06-28
GPS unreliable within 16 miles of 44-20.0N 037-47.5E2016-08-03
NAVTEX station kerch off air2014-11-06
Nga chart 55180 (2ND ed)2011-08-31
Radiobeacon at belosarayskiy zaliv light 46-52.9N 037-19.5E off air2004-05-12

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 16:17Z; 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.