After receiving my watch, I tried everything.
I restored the factory default options, I tried pairing with Garmin successfully and then left the watch on the go in activity waiting for GPS for an hour without success.
I started again trying to enter the information manually. I accepted the time setting by GPS, it was waiting for GPS for more than an hour without success. I do not have a GPS on my Vivoactive 3.
The watch is exposed to the sky in the mountains without 1400m without trees or buildings.
Someone knows how to hang the GPS?