Volcanic

Cancel HYDROLANT 2413/21 and this msg, volcanic activity ended

Eastern North Atlantic · Canary Islands · HYDROLANT 3189/21

What this record establishes

Archived notice · 2021-12-29 13:41Z

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 477/21 291340Z DEC 21.. Issued 2021-12-29 13:41Z. 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
Eastern North Atlantic · Canary Islands. No usable coordinates were parsed; a location-based nearby search is unavailable. Check the original wording for limits and qualifications.

Related notices and cancellation links

These reports were linked by category and sea, with positions within 30 nautical miles and issue dates within 30 days of another report's recorded in-force span. Links can extend through other members, so the full group can cover a larger area or period. Proximity does not confirm that they describe one incident.

  1. HYDROLANT 2369/212021-09-21 · Archived notice
  2. HYDROLANT 2413/212021-09-27 · Archived notice
  3. HYDROLANT 3189/21 · this notice2021-12-29 · Archived notice
Compare all 3 notices, changes and original texts →
issued
2021-12-29 13:41Z
status
Archived notice
authority
NAVAREA II 477/21 291340Z DEC 21.
NAVAREA
NAVAREA II · named as the source of this relay
source
NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z

Original warning text

EASTERN NORTH ATLANTIC.
CANARY ISLANDS.
DNC 01.
CANCEL HYDROLANT 2413/21 AND THIS MSG,
VOLCANIC ACTIVITY ENDED.

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.
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.
Volcanic activity
An erupting or restless volcano near or under the sea, with a keep-clear radius around it.

All warning terms →

Nearby notices listed in force · within 120 nm

No parsed position is available for this comparison.

Worldwide in the collected sources

12 volcanic activity listed in force · see all

Record snapshot 2026-10-02 03:02Z; source collection times vary.

Volcanic

Submarine eruptions, discoloured water, pumice rafts. All current volcanic activity →

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.