glassninja
Meet the OnCourse Goggles: a pair of goggles that help you swim straight to avoid wasting energy when competing or trying a new challenge. You get an electronic compass, an accelerometer, a microprocessor, and a rechargeable battery in this device. OnCourse provides you with a real time feedback through a small LED array in each eyepiece.
More items like this: here
OnCourse Goggles let you know when you are veering off course. Yet another interesting Kickstarter project.
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