Your ANAFI series drone does not need a satellite – GPS, Glonass, Galileo – synchronization (or fix) to take off.
It can therefore be piloted indoor and through cluttered areas, stabilized by its onboard sensors.
However, automated and assisted flight modes require both the drone and the FreeFlight 6 device (preferably associated with the Parrot Skycontroller 3) to be synchronized to geocoordinate satellites – the Parrot Skycontroller 3 alone has no geo-positioning capacity.
For this reason, Parrot recommends ANAFI series drones pilots to always set up, start and finish their automated and assisted flights from wide open areas, as a sports field.