There are some decent datalogging apps for iPhone or Android if you already have one of those platforms. They're not really "professional"-level, but it gets the job done for reviewing your sessions to learn from mistakes. The important thing is just bringing together OBD-II data (RPMs, inferred gear), GPS data (track position, speed) and video. You can do the video separately on GoPro and then sync that with other data from the smartphone software later on a PC.
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