well, if you are using road runner, you can use this autoit script:
Code:
$file = FileOpen("c:\gpslog.txt", 1)
$index = 0
If $file = -1 Then
MsgBox(0, "Error", "Unable to open file.")
Exit
EndIf
$rr = ObjCreate("RoadRunner.SDK")
while 1
$spd = $rr.GetInfo("GPSSPD")
FileWriteLine($file, $index & "," & $spd)
$index = $index + 1
sleep(7500)
wend
FileClose($file)
it basically queries RR for the gps speed that its displaying every 7.5 seconds and saves it to c:\gpslog.txt. It does not close the file untill you kill road runner and it throws an error... I could have made it better but I am lazy and it works.