![]() For some reason, when I navigate to the Finish line and select that as the sync point, the data in the finished rendered video is one second off (the data is early). Issues: Whenever I sync a GoPro video, in my experience, I have found that HLT has always had a bug in it when trying to synchronize the Finish Line in the GoPro video to the data. Then you find the finish line as the sync point for the video and then render it. Then, using an iPhone app called "DC Copy" (free), I copy the video to the iPhone. First, on my Mac, I find the video of the specific lap I want and save it as it's own video. Importing GoPro videos isn't too hard into an iPhone. HLT video overlays are nice because they're clean, and they spoon feed you your fastest speeds on straights and slowest speeds in corners as pop up graphics. And you can look at the speed profiles to see why. 25 seconds of the red lap through Phil Hill, but then starting after Phil Hill, the white lap lost significant time-about 1.1 seconds. What these two charts are showing is that the white lap was within about. I zoomed in on the section from the bottom of Phil Hill to the front straight. The image on the right shows zooming in on a portion of the track which is indicated by the orange highlight on the Buttonwillow profile. The numbers up the right side show the time difference between the two laps which is indicated by the light gray area that fills the background. The red lap is the Reference lap and the White lap is what I'm comparing it to. The numbers up the left side show speed which is indicated by the red and white lines which are the two laps. You can see the Buttonwillow profile in the background. The left image shows data from the whole track. You can zoom in on that page and focus tightly on any section of the track. You can compare any lap to any other lap at the same track and see where you gained and lost time. My favorite analysis feature is the page shown below. If you mount it on your windshield and have HLT record video on the iPhone, it can immediately overlay data on a video of the lap as soon as you're done driving. Also, if you always keep laps with the fastest sectors, you can see what your fastest EVER theoretical lap is, from all your visits to that track. ![]() When you set up a track, you can create as many sectors as you like and it shows you a theoretical best from those sectors. It provides immediate feedback as soon as you hop out of your car. With the external Emprum GPS device attached, it's very accurate-usually within 1/10 second of the transponder. Notes: I've enjoyed using HLT for the last 4 years. Method of data overlay onto video: Done inside HLT with imported GoPro video You cam send a lap directly to another iPhone with HLT, email, dropbox, etc. GPS: Emprum UltiMate GPS (via a Lightning adapter) 5Hz refreshĮxport/import compatibility: Yes - various options of export. Software: Harry's Lap Timer (HLT) - Grand Prix Edition They each do things that I like so I've continued to run them both. I started with Harry's Lap Timer on my iPhone and then later got an AIM Solo DL.
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