When you plug your phone into iTunes, under your device go to the Photos tab and click "include videos".

Got it! Thanks!!

OK, moving along here... hit the Restore button and got the videos into my Photos app and the app recognizes them when I go to Settings-->Video List. However, when I hit Lap List in the bottom left and find the lap that corresponds to the video, I don't see an Overlay button anywhere. I reviewed my ...

Thanks, Harry. You've got me on the right track now. My next problem is that I have loaded my video on to my iPhone, but the app isn't recognizing it. I believe this is because the video went into the Videos app rather than the Photos app. Any ideas? Thanks!

I purchased HLT years ago and used to have the Overlay feature in the app. I used it to merge GoPro videos with lap data in the past. Now it appears this feature has been stripped from the current "Rookie" version I had purchased before and is now in the Petrolhead version. Am I really exp...

Thanks, Harry, for that very quick and informative response! I am thoroughly convinced that update rate isn't a significant source of error by any means. That seems to leave two remaining sources of error: position and velocity. How accurate is the the iPhone 4 out of the box, and how much of an imp...

Just curious, how is .1 sec accuracy achievable with a 1 hz refresh rate? I assume there is some intense interpolation happening but would like to know more.

Thanks!