So right now I'm logging GPS and ATTITUDE_MED.  My logfile looks something like this:

Dumping Log 1,    start pg 1,   end pg 17

ArduPlane V2.34
Free RAM: 3626
GROUND START -  0 commands in memory
CMD:0,16,0,14820,486563850,-1234133230,
MOD:Manual
MOD:Stabilize
PM:25691,1,79,0,0,0,0,0,1,0,0,0,0,
ATT: 4, 2, 30339
GPS: 68474505, 0, 1, 0.0000000, 0.0000000, 0, 0.0000, 137.0000, 0.0000, 0.0000
ATT: -8, 3, 30334
GPS: 68474505, 0, 1, 0.0000000, 0.0000000, 0, 0.0000, 137.0000, 0.0000, 0.0000
ATT: -1, 1, 30336
GPS: 68474505, 0, 1, 0.0000000, 0.0000000, 0, 0.0000, 137.0000, 0.0000, 0.0000
ATT: -3, 2, 30337
GPS: 68474505, 0, 1, 0.0000000, 0.0000000, 0, 0.0000, 137.0000, 0.0000, 0.0000
ATT: 6, 7, 30336
GPS: 68474505, 0, 1, 0.0000000, 0.0000000, 0, -0.0800, 137.0000, 0.0000, 0.0000

As you can see, the GPS unit hasn't got a lock yet, so the time and lat/long/alt are all invalid values.  But just for example's sake, I'm trying to figure out which ATT line corresponds to which GPS timestamp.  Basically, is it the one preceding or the following the GPS line?  Or does it even really matter?

Thanks!