Scientists develop a high-precision router

https://techxplore.com/news/2024-02-scientists-high-precision-router.html

 "uses 2 WiFi devices whose high directive antennas emit 60GHz (high frequency) and positioning algorithm, instead of .GPS' triangulation... locates mobile phone 7m away with error <3 cm... accurately find when signal arrived, locating mobile phone with single antenna... WiFi improves  accuracy... 60GHz antenna rotates until it locates you and then starts measurement, sending several messages to which phone responds enabling router to know how long signal is in air and thus distance"