This developed and made in Switzerland instrument instantly gives you an accurate reading of the speed on water, maximum speed and traveled distance. No hole on your boat needed !
Easy to install: setting the propeller under water with one of the three wings included, set the radio transmitter in the hull and that's all!

Magnetic Transmission through the hull and without holes (patent JDC) and radio transmission on the screen (up to four meters). Possibility of establishing the screen anywhere on the boat and for each crew member with its display unit.

Possibility of using existing detectors paddles. Calibration for possible interaction with any type of speed controller (JDC propeller blade or sensor).