Have a P 3 advance, have a I pad Mini 2 wi fi only, is working OK with no video delay. Is there any reason to up grade to a Mini 4 Wi Fi / Cellular and Not Activating the service,but only getting it for the GPS chip built in it and don't really plan on doing the "Follow Me Mode" So what do you give up ?? not having GPS in the Controller and just on the Aircraft only. Thanks