Automatic Vehicle Locator based on GPS tracking system. In Automated Vehicle Locator (AVL) systems satellite & land communications are used to display each vehicle s location, status, heading, and speed on the computer s screen. It is used for Real time tracking of Vehicle,cargo,Fleet control,Animal control and so on.-Automatic Vehicle Locator based on GPS tracking system. In Automated Vehicle Locator (AVL) systems satellite & land communications are used to display each vehicle s location, status, heading, and speed on the computer s screen. It is used for Real time tracking of Vehicle,cargo,Fleet control,Animal control and so on.