Sony GPS chipset
[...] all new Garmin devices in the last few years, most new Suunto devices in the last few years, all Polar devices in the last few years, all COROS devices, the Wahoo RIVAL, and more. More or less everyone except Apple.
[...] The issue has to do with the
ephemeris data file, also called the EPO file (Extended Prediction Orbit) or Connected Predictive Ephemeris (CPE). Or simply the satellite pre-cache file. That’s the file that’s delivered to your device on a frequent basis (usually every few days). This file is what makes your watch near-instantly find GPS satellites when you go outside. It’s basically a cheat-sheet of where the satellites are for the next few days, or up to a week or so.
