GPS log files do contain data.
Example;
A,111117,174325,4259.1939,N,8346.3395,W,3.8,0.43,0.77,0.07;
A,111117,174326,4259.1962,N,8346.3394,W,6.5,0.43,0.70,0.12;
A,111117,174327,4259.1995,N,8346.3395,W,9.6,0.44,0.77,0.10;
A,111117,174328,4259.2042,N,8346.3395,W,13.6,0.59,0.67,-0.30...