Not all modules have this feature; and it's also locked behind feature/license bits sometimes. It's obviously not needed for normal GPS use… u-blox timing targe

Not all modules have this feature; and it's also locked behind feature/license bits sometimes. It's obviously not needed for normal GPS use… u-blox timing targeted modules definitely have it. Some have a "measure-in" mode where you let it sit for a while (days) and it does all the setup automatically. Other cases you actually have to feed things into the module (annoying and error prone…) It's simply that if you know your location, you can remove that as free variable from the equations and instead constrain the time further.