Hf communications and GNSS positional information may be disrupted by the effects of solar flares

issued

2017-09-08 05:12Z

status

cancelled 2017-09-11 05:09Z (archive)

self-cancels

2017-09-11 05:09Z

authority

NAVAREA XI 572/17 080431Z SEP 17.

source

nga_json · first seen 2026-08-17 13:38Z

SPACE WEATHER.
1. HF COMMUNICATIONS AND GNSS POSITIONAL INFORMATION
   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 THIS MSG 110509Z SEP 17.

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.