Navionics App
While moving the speed and heading provided by the app drops to nothing randomly while using new version of Iphone SE and new Gen 4 Ipad.
I solved this problem myself by getting a portable Garmin Glo 2 GPS receiver from Amazon and all works fine now with better gps signal. This problem all started when Apple combined the Cellular and GPS chip together. Navionics works better on the older units. Hope this helps everyone.
iPad (4th gen) Wi-Fi + Cellular