I too am having this problem with a USGlobalSat BU-353. Using VisualGPS, I know that the GPS is active, has a lock, pushing data on COM3 (Prolific USB-to-Serial COM Port) and the NMEA stream is being written to the port. However, ArcGIS Explorer does not recognize a GPS device is attached or active and I cannot find a configuration page for GPS in ArcGIS Explorer that allows me to confirm the COM port that it is 'listening' to... Please advise...thanks, SAT
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