In Snippot we provide people with this feature so that they know when they are entering a particular radius or leaving it. There can be different use cases for this feature, we believe. For instance, say you are in a cab approaching a destination. Youre not sure when to start paying the charge and, on the other hand, you want to read your favorite book in relaxation; therefore, simply set the destination and set the radius and dive deep into your book. We will let you know when you need to take action in due time.