This is just off the top of my head but once per second on a track is a lot of distance covered between data points. Most of the automotive based systems are down to one to two tenths of a second. It's cool that the watch can temporarily store the info and transfer to a computer later but you might be better off with something like MaxQData linked to a pocket pc for about the same price with software designed for automotive purposes. That's the route I'm researching right now.