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Instrument: GEK : Geomagnetic Electrokinetographs
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The Geomagnetic ElectroKinetograph (GEK) measures currents by
measuring the electrical potential induced in sea water when a
conductor (sea water) moving in a magnetic field (Earth's
field). It consisted of a pair of electrodes towed behind a
ship. The electrodes were at the beginning and end of line
several hundred meters long. Or, the electrodes were at ends of
submarine telephone cables. The accuracy of the technique was
difficult to quantify and the technique fell from favor. The
primary error was due to unknown shorting of current by
conduction through the sea floor and in still water below moving
surface currents.

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[Summary provided by Texas A&M University]