Volcanic

Nga chart 51260 (4TH ed)

North Atlantic Ocean · HYDROLANT 1863/11

What this record establishes

Archived notice · 2012-02-04 10:33Z

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) · EL HIERRO VOLCANIC ACTIVITY 082054Z NOV 11.. Issued 2011-11-08 21:43Z. 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 27.583, -18.000. 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

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 1669/112011-10-10 · Archived notice
  2. HYDROLANT 1863/11 · this notice2011-11-08 · Archived notice
Compare all 2 notices, changes and original texts →

Current notices and reporting history in the North Atlantic Ocean →

issued
2011-11-08 21:43Z
status
Archived notice
authority
EL HIERRO VOLCANIC ACTIVITY 082054Z NOV 11.
issued by
EL HIERRO VOLCANIC ACTIVITY
sea
North Atlantic Ocean
position
27.583, -18.000
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.
NGA CHART 51260 (4TH ED).
DISCOLORED WATER WITH SUBMARINE VOLCANIC
ACTIVITY REPORTED VICINITY 27-35N 018-00W.

Reading this warning

Chart reference
The number of the nautical chart on which the reported position lies.
Discoloured water
Patches of unusually coloured sea — often a sign of a submarine volcano or of a shoal.
Volcanic activity
An erupting or restless volcano near or under the sea, with a keep-clear radius around it.
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.

All warning terms →

Collected reports in this area · volcanic activity

4 within 180 nm since 2011 · 0 in the last 12 months · 0 listed in force now

11
15
20
21

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

12 volcanic activity listed in force · see all

Record snapshot 2026-10-02 04:03Z; 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.