GooPs Pro has a built in record/playback capability. When you press ther “Record” button, all NMEA data from your GPS will be logged to a file (any previously recorded data will be lost). When you press the “Play” button, whatever was recorded will be played back in Google Earth. You can adjust the speed of the playback with the Playback/Demo speed slider.
You can play back NMEA logs with any version of GooPs. You just need to convert the data from your GPS to NMEA (try gpsbabel) (also try to turn off any track compression in your GPS if you can).
Once you have the NMEA logs, there is a somewhat hidden feature in GooPs that allows you to replace the “Demo” vehicle track data with your own data. Just name the NMEA logs with the names of the demo vehicles followed by “.nme” ( e.g. “Cin.nme”, “David.nme”, etc). Place the files in the same directory from which you are running GooPs. This will allow you to play back all of the vehicles at the same time. You may need to edit the logs so they all start at the same time. In the current version of GooPs the “race” may not start ’til about 120 points in. This will be fixed in the next release.