gpsdrive

"Gpsdrive is a map-based navigation system. It displays your position on azoomable map provided from a NMEA-capable GPS receiver. The maps areautoselected for the best resolution, depending of your position, and thedisplayed image can be zoomed. Maps can be downloaded from the Internet withone mouse click. The program provides information about speed, direction,bearing, arrival time, actual position, and target position. Speech output isalso available." (Description on Freshmeat)