Other

Hf and lf communications may be disrupted by the effects of solar flares

Solar Activity · HYDROLANT 1209/12

issued: 2012-06-05 14:52Z
status: cancelled 2012-06-07 00:01Z (archive)
cancels: HYDROLANT 1197/12
authority: SWPC 04 JUN 12.
source: nga_json · first seen 2026-08-17 13:38Z

Original warning text

SOLAR ACTIVITY.
1. HF AND LF COMMUNICATIONS MAY BE DISRUPTED BY THE EFFECTS
   OF SOLAR FLARES.
2. DURING INCIDENTS AT SEA, MARINERS SHOULD CHECK THEIR
   POSITION USING ALL ALTERNATE MEANS AVAILABLE.
3. CANCEL HYDROLANT 1197/12.
4. CANCEL THIS MSG 07 JUN.

Timeline

Hf communications may be disrupted by the effects of solar flarescancels · 2012-06-04
Hf communications may be disrupted by the effects of solar flaresreplaced · 2012-06-04

Nearby now · within 120 nm

Nothing else in force within 120 nm.

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Other

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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.