OT: Ghost ships, crop circles, and soft gold: A GPS mystery in Shanghai

I would be /extremely/ surprised if it was only Russia doing that.

A few years ago there was a spate of NOTAMs warning of /future/ GPS location unreliability over west Wales.

I've heard of a glider pilot whose satnav indicated he was directly over RAF Boscombe Down, when he could clearly see the runway a mile or so away, off the end of his wing.

Sounds like they're barking up the wrong tree with this GPS spoofing theory . The transponder query RF communications channel is a decades old vestige of the original AIS system. These days they're doing a lot of communication of data with wireless internet. Hackers are sending bogus information pack ets that somehow get assigned a higher priority than the ship's messaging.

On Nov 16, 2019, Winfield Hill wrote (in article ):

My first thought upon seeing those circles was that perhaps a DRFM repeater spoof jammer of some sort was being used. .

. One remedy is Controlled Reception Pattern Antenna (CRPA) GPS antennas.

Joe Gwinn

The sky is falling:

Oh ... never mind ("fixed" 35 years ago (1984)):> .