A microprocessor with a write queue for a branch target address cache is disclosed. An image data of the desired area is extracted from an image data of a document read at the desired resolution. The support unit further includes an installation fastener for connection to vehicle support brackets. Gain and noise of the signal are estimated responsively to the defined clusters. This approach addresses the problem presented by the limited size of the radio communications link between the Location Server and Client versus the very large bandwidth of multiple DTV channels.