The ability to search for vehicles in real time, it's easy to create alerts if you need them. It can be very costly when using this service as opposed to other services like Google Maps or Waze. You have to pay per vehicle searched which is not cheap! But worth every penny considering how useful it is. I'm searching for vehicles across multiple counties but also am able to get live updates of any traffic incidents that occur along my route. This saves me so much time going back and forth between different apps and websites while driving!