Hi Benlebo, Bluetooth is not required to turn ON for Find My Mobile, please refer below link on how to track your device using Find My Mobile.
Hey there! Huh, that is cool and creepy! Samsung is so awesome to make such mixed experiences! No connection but your device can still be tracked? Creepy! But yeah, if you lost it with no network around? Cool! I guess because Bluetooth is not used, it uses ad-hoc wifi? Maybe? That would be nice!