The app shows your moving direction while you walking and the direction your parked vehicle in reference to your moving direction.
The app speaks the text message when the app does not show the map for user to view.
Here are brief howtos:
1. After you parked your vehicle, click "Parking" icon (the second icon from the left) to remember the location of your vehicle.
2. Whenever you want to know the location info about your parked vehicle, click "i" icon.
3. When you want to get the direction from your current location to the location where your vehicle is parked, click "Navigation" icon (the first icon from left).