Chosen Solution
My iPhone 6s GPS will identify my initial location in map apps, but will not follow me or update and displays inaccurate location while using navigation apps. Have tried everything to reset the device, but nothing works. Help!
Scott Riggs download a simple GPS diagnostics App from places like this and test your GPS. Right now it sounds like you are having issues with your GPS IC. To possibly repair this you would require the services of a micro-solderer like @refectio or @teetopp
