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Out here on the West Coast, we rely on the use of tried and true timing lights to gather performance data. The Brower Timing Systems use optical sensors set up at the beginning and end of a measured distance to gather data. This system is simple and reliable, but the data it can generate is limited. Still, for the tests that most magazines perform, it's more than adequate. One advantage is that this system doesn't require a clear view of the sky to function correctly.