PointBack is an easy way to navigate back to where you parked your car or where you set off on a walk. When you press the "Store" button your location is stored in the app. When you want to go back again you simply turn the app back on and it will display a 3D arrow pointing which way you need to turn. When you get close it will display a purple sphere indicating your destination.
PointBack indicates location accuracy on-screen and in the size of the purple sphere indication the location of the stored point - the less accurate the location information the larger the sphere appears.