Nasa Electgro Magnetic Log & Data BoxThe EML-3 electromagnetic speed log measures the boat speed through the water with no moving parts. - Speed range 0.2 – 40 Knots
- Speed, trip and total logs
- Pulse output to suit paddle log input
Electromagnetic Log – speed through water – with no moving parts! The EML-3 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. | 
