"Laser Ranging Makes GPS Satellites More Accurate" by @hackaday - Laser retroreflector on newest #GPS satellite is the first of what will be on all upcoming GPS satellites. Similar reflectors left on the Moon by Apollo astronauts allow scientists to measure distance to the Moon to the millimeter. Same use for GPS satellites will reduce error in their estimated trajectory, and improve #positioning, #navigation & #timing #PNT derived from them. https://hackaday.com/2026/03/29/laser-ranging-makes-gps-satellites-more-accurate/ #GNSS #satellite #space