Assisted GPS

Assisted GNSS (A-GNSS) is a GNSS augmentation system that often significantly improves the startup performance—i. e. , time-to-first-fix (TTFF)—of a global navigation satellite system (GNSS).

A-GNSS works by providing the necessary data to the device via a radio network instead of the slow satellite link, essentially "warming up" the receiver for a fix.
When applied to GPS, it is known as assisted GPS or augmented GPS.
Other local names include A-GANSS for Galileo and A-Beidou for BeiDou.

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Source: Wikipedia · Image: Wikimedia Commons · CC0

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