Teensy 3.6 + Garmin Water Speed Senor

Speedometer

Output


79ms,	25.32cm/s
41ms,	48.78cm/s
43ms,	46.51cm/s


Photo

5 volts

GPS can be used to measure the speed of a boat. However for finer response or slow speed then a paddle wheel is useful. If the boat is moving within a tidal current, then GPS will not be accurate for the boat speed in the water.

Fritzing

Image developed using Fritzing

Sketch