My fake makes files like this (GPSxxxx.txt):
2013/01/16-13:32:08,24.653460,59.300362,980,62,66,1136,445,453,980,62,66,8,0.000000,56,0,0.000000,86,39011,283
2013/01/16-13:32:09,24.653761,59.300369,929,78,58,1136,445,453,929,78,58,8,0.000000,57,0,0.000000,86,39027,271...