1. A Personal Digital Location Assistant comprising: processing means, including a standard software operating system and an application program for processing global positioning system (GPS) location information according to said application program and providing navigation information based upon said application program, and including means for issuing a mode control signal and a command control signal; and a GPS Smart Antenna including input select switch means coupled to a DGPS radiowave receiver for receiving a DGPS signal including DGPS error corrections and coupled to the processing means for receiving said command control signal, said input select means for selecting one of said DGPS signal and said command control signal according to said mode control signal; wherein the GPS Smart Antenna includes means for receiving GPS satellite signals from one or more GPS Satellites where each GPS satellite issues a distinct GPS satellite signal, and for providing said GPS location information.