Hi, new IPad Air user (never even had a Smart phone) what do I need to use Sat Nav - I have Wi-Fi plus Cellular capabilities. Was told by Apple team before I purchased my IPad that I would be able to use Sat Nav for free if I took cellular model. I have tried Googling for help but have seen various conflicting reports which assume I know more than I do (most assume basic knowledge of smart phone) . I have no need for WiFi outside my home EXCEPT TO BE ABLE TO USE SAT NAV so that would make it expensive if I had to take a monthly subscription. Would greatly appreciate any help.