NASA wireless wind sensor plus data box

The new Clipper electromagnetic speed log measures the boat speed through the water with no moving parts.
Robust and accurate, the sensor generates an alternating magnetic field below the boat and measures the resulting electric field produced by the boat moving through the water. It is designed for installation into most types of GRP hulls.
With excellent linearity and a resolution of 0.1 Knot, over the range 0.2 to 40 Knots, the log sensor sends signals to a control box which then converts the sensor signal to boat speed, trip and total distance. This data is transmitted in NMEA 0183 format to a new Clipper EM Log display unit.

Clipper EM Log display
110 x 110mm industry standard square case
NMEA 0183 input
Speed in Knots
Trip and Total logs in nautical miles
Multi level display backlighting

EM transducer and interface box
Speed range 0.2 – 40 Knots
NMEA 0183 output sentences VLW + VHW
Standard 50mm diameter transducer
Cable length 5.0 metres