Nav aids

Mf, hf, and dsc services unreliable 241300Z to 241800Z apr at uscg remote communication facilities: a.…

North Atlantic Ocean · NAVAREA IV 462/24

What this record establishes

Archived notice · 2024-04-24 19:00Z

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) · COGARD COMMUNICATIONS COMMAND 0/24 232037Z APR 24.. Issued 2024-04-23 20:51Z. 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: North Atlantic Ocean. The parsed report position is 30.874, -77.150. 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 North Atlantic Ocean →

Activity windows · 1 in this warning

opens (UTC)	closes (UTC)	local	length
2024-04-24 13:00Z	2024-04-24 18:00Z	—	5 h

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

issued: 2024-04-23 20:51Z
status: Archived notice
self-cancels: 2024-04-24 19:00Z
authority: COGARD COMMUNICATIONS COMMAND 0/24 232037Z APR 24.
NAVAREA: NAVAREA IV
issued by: COGARD COMMUNICATIONS COMMAND
sea: North Atlantic Ocean
position: 30.874, -77.150
source: NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

1. MF, HF, AND DSC SERVICES UNRELIABLE 241300Z TO
   241800Z APR AT USCG REMOTE COMMUNICATION
   FACILITIES:
   A. BOSTON (F) 41-42.80N 070-30.30W.
   B. CHARLESTON (E) 32-50.70N 079-57.00W.
   C. CHESAPEAKE (N) 36-43.70N 076-00.60W.
   D. MIAMI (A) 25-37.40N 080-23.40W.
   E. NEW ORLEANS (G) 29-53.10N 089-56.70W.
   F. SAN JUAN (R) 18-27.00N 066-06.00W.
2. CANCEL THIS MSG 241900Z APR 24.

Reading this warning

DSC (Digital Selective Calling): The digital radio alert built into modern marine radios — one button sends a distress alert with the vessel's identity and position.
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.
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

33 within 180 nm since 1998 · 4 in the last 12 months · 1 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.

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

Broadcast and communication services unreliable at uscg remote communication facilities: a. boston 41-43.00N…Nav aids · 17.3 nm

Worldwide in the collected sources

139 aids-to-navigation notices listed in force · see all

Record snapshot 2026-09-28 03:47Z; 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.