The “Predicted Satellite Data Service” (PSDS), or the vendor-specific term of gpsOneXTRA, data can be good for up to 7 days. If GNSS keeps functioning for days with an Internet connection it's likely that PSDS is in use. The data is public and is available at URLs like:

http://xtra1.gpsonextra.net/xtra.bin

http://xtra2.gpsonextra.net/xtra.bin

http://xtra3.gpsonextra.net/xtra.bin

For example, see https://www.exploit-db.com/exploits/40502