How does GPS determine heading in 2017?
My question is how do GPS systems today determine what direction you are facing, also known as heading. The only two options that immediately come to mind are either with an electronic compass, or by looking at the previous "bread crumbs" coordinates and determining what direction you are going by looking at where you have been. I know most cell phones have compasses built in to them, but is that what is used? What about regular car mounted gps? Thanks!