Fleet is a tool used to track assets or vehicles using specific tracking devices that are installed. With fleet you will have a much clearer idea about where these vehicles and assets may be, and will have a host of other options regarding tracking.
Fleet is designed to track a GPS device that can be installed on a vehicle or other type of asset without the need of a cell phone or other wireless device. It can alter its tracking based on if the ignition is running or it senses movement depending on the device so it can save on power use.