A Japanese team of researchers are working on a positioning system using muons, which could be used in places where GPS signals can’t be received (such as underwater or underground).
The article discusses many of the challenges and reasons why it currently isn’t ready for practical applications. But it certainly is a very interesting technology.
The approach requires multiple base stations, each in the path of a ray which is detected at both the station and receiver, and the receiver’s position can only be known if there is communication with the stations.
Indeed. It seems this wouldn’t be useful for applications where real-time position is needed. You would most likely do the calculation at a later time like in the Miikshi video. It’s a little confusing from the article, but the video actually does a good job of explaining this limitation.