Nasa Marine Electromagnetic Log and Data Box

The 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.
With excellent linearity and a resolution of 0.1 Knot, over the range 0.2 to 40 Knots,
the control box converts the sensor signal to a pulse output to connect to any NASA
Marine paddle wheel log display ~ Clipper Duet, Clipper Log, Target Log, Stingray Log