I find it puzzling that without unlocking my phone, I can ask siri to take me home and it will start navigation. But if I run my Heading Home shortcut I would hear "running your shortcut........sorry there is a problem with the app." I changed the navigation app to Apple maps, google maps or another beta program and none of them work. Unless I unlock my phone first and the navigation app open and show my home address, all three of them work this way.