Nasa Electromagnetic Log, data box and Target EM Log Display

Target EM Log display

• 132 x 98mm compact size case with high contrast LCD
• NMEA 0183 input
• Speed in Knots
• Trip and Total logs in nautical miles
• 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

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 Target EM Log display unit.