I grew up in the country on property. Plus my dad lives across the street from 7,200 acres of Federal land in the Manistee National Forest in Michigan. Since I grew up there, I know that area well. Now a days I'm wanting to explore other parts of my state's public land. I downloaded OnX yesterday. It seems great! After my trial period, I'm going to buy the Premium membership. Is the Premium+Chip option only for handheld GPS's, and not for cell phones? I just want to make sure I won't be losing functionality that I'm seeing now during my trial phase with the app. I understand that I can download maps in areas I plan to visit if I'm uncertain if that area has cell coverage. If I don't have cell service and I download the map, will the GPS function of a modern cell phone be as good as a dedicated handheld GPS? Asked another way, do cell phones use their data coverage for GPS or do they have another built in GPS? Thanks!