The Speedpuck is an excellent device for displaying the speed of a small sailing dinghy. At around 225 pounds, not a cheap gadget for casual day sailing.
Small speed improvements may be achieved by tiny adjustments of sail trim, which can be difficult to detect unless a GPS or some form of speed display is in use. When travelling at only 4 or 5 knots a small increase can represent a considerable percentage speed gain.
The Challenge.
I wonder if I can build something that will do the same job for a fraction of the cost?
Construction details and code here.
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