1. An apparatus for controlling an operation based upon the determined location of a user, comprising: a receiver associated with the user for sensing and measuring a plurality of physical parameters present at the location of the receiver; a database associating a plurality of known locations with corresponding reference data sets of physical parameters; means for correlating the measured physical parameters with the data sets to identify at least one best match therebetween; and means for controlling an operation based upon the identity of the at least one best match.