The Aim Of This Project Is To Develop An Automotive Security System For Anti-theft Using Embedded System Occupied With A Global Positioning System (GPS) And A Global System Of Mobile (GSM). The Client Interacts Through This System With Vehicles And Determines Their Current Locations And Status Using Google Earth. The User Can Track The Position Of Targeted Vehicles On Google Earth. Using GPS Locator, The Target Current Location Is Determined And Sent, Along With Various Parameters Received By Vehicle’s Data Port, Via Short Message Service (SMS) Through GSM Networks To A GSM Modem That Is Connected To PC Or Laptop. The GPS Coordinates Are Corrected Using A Discrete Kalman Filter. To Secure The Vehicle, The User Of A Group Of Users Can Turn Off Any Vehicle Of The Fleet If Any Intruders Try To Run It By Blocking The Gas Feeding Line. This System Is Very Safe And Efficient To Report Emergency Situations As Crash Reporting Or Engine Failure.