Yes, it is possible to make this setting – but only in the case where a SIM card is inserted in the Navigator.
Use this function to start larger downloads only via Wi-Fi, e.g. to save mobile data of your smartphone or SIM card. Please note the tariffs and conditions of your mobile communications provider.
Important: If you use your smartphone as a hotspot, then this connection is interpreted by the Navigator as Wi-Fi and thus an update is also downloaded with a Wi-Fi connection via the smartphone hotspot.