https://www.newscientist.com/articl e/2143499-ships-fooled-i

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https://www.newscientist.com/article/2143499-ships-fooled-in-gps-spoofing-attack-suggest-russian-cyberweapon/

Could someone explain what sort of device could cause a GPS satellite to give out the wrong information? Or is it sending fake information to GPS devices and overriding their signals?

It mentions:

"Satellite signals are very weak – about 20 watts from 20,000 miles away – so a one-watt transmitter on a hilltop, plane or drone is enough to spoof everything out to the horizon."

and

"The scale of the problem did not become apparent until people began trying to play Pokemon Go. The fake signal, which seems to centre on the Kremlin, relocates anyone nearby to Vnukovo Airport, 32 km away. This is probably for defensive reasons; many NATO guided bombs, missiles and drones rely on GPS navigation, and successful spoofing would make it impossible for them to hit their targets."