I have a Samsung tablet and have been trying to make it work instead of my phone. DJI 4 and Mavic Air. Navigation doesn't seem to be working properly on-screen. I thought I read somewhere that some functions require I have a working SIM card. I de-provisioned my SIM a couple months ago since I didn't think I needed to spend the extra $10 a month when I always used the tablet with my WIFI. Anyone knows if a SIM is needed for anything?