Assuming it is the system I'm thinking of, it is all about sepeeding up the time to a first fix. Without it can be quite a few minutes to get a fix. https://en

Assuming it is the system I'm thinking of, it is all about sepeeding up the time to a first fix. Without it can be quite a few minutes to get a fix. https://en.m.wikipedia.org/wiki/Assisted_GPS https://en.m.wikipedia.org/wiki/Assisted_GPS