A method for a warehouse management system to record an object inventory file in a computer-readable database. The frequency tracking mechanism derives frequency error information from the recovered data to determine the adjustment needed at the mobile station’s local voltage controlled oscillator in order to track the frequency of the base station. Runtime information may be collected on a line of a trace each time that trace is executed by a processing core. Moreover, the velocity and level set correctors in axi-symmetric coordinate systems should be \u201crecovered\u201d to point values before being projected. The invention also provides an abrasive product made by the method. The invention has been found to increase fuel efficiency in large trucks by ten to fifteen percent.