DEI, the makers of the Viper alarm, have a GPS tracking sysem. Also something worth investing in is a hood-lock system to go along with your alarm. Its a hiden cable that includes a starter kill function. Takes a special key to unlock your hood and its hidden inside your car. That way if someone busts your window then trys to pop your hood and rip out your siren, they'll be SOL when the hood doesn't pop.