An American company specializing in detection of GPS interference has reported that Russia is using GPS jamming in the Ukraine region. See
More information and commentary on this electronic warfare tactic is given by
GPS jamming by Russia had been noted in the Russian military build-up of forces preparing for the invasion of Ukraine as early as almost one year ago:
https://www.gpsworld.com/russia-ramps-u ... ne-border/
Articles about GPS, GLONASS, GALILEO, WAAS and other satellite navigation systems
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The gov't has been looking into e-LORAN for this exact reason. There's a company here in MA that is one of the leaders in that field. I'm also connected to a group of prior LORAN-C techs since I served in the Coast Guard on LORAN chains 5970 and 9970 in the Far East back in 1987-90.
The LORAN infrastructure was literally blown up during the Obama administration when the USCG stated they had no use for it. This was an unfortunate waste of many beautiful towers, antennas, and transmitters by people who were on some sort of a political campaign against LORAN.