GPS

Researchers have developed the world's most accurate atomic clock, an advance reported by Phys.org. The new clock pushes precision beyond previous devices, improving timekeeping so finely that it could lose essentially no time over the age of the universe. Such clocks underpin GPS, telecommunications and fundamental physics tests, including measuring gravity's effect on time and searching for dark matter.

Galileo, the European Union's satellite navigation system and alternative to American GPS, has demonstrated its first cryptographically authenticated position fix while under active spoofing attacks. The achievement means receivers could verify that a location signal genuinely comes from the satellite constellation rather than an imposter. It matters because GPS spoofing is a growing threat to aviation, shipping and critical infrastructure, and Galileo's OSNMA-style encryption offers a defence other systems lack.