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Electromagnetic sensors

Are those electromagnetic sensors expensive and complicated for use in underwater weapons?

Question: The magnetic and electric signatures radiated from a ship can not be sensed with human senses (like the noise from the ship) and it is hard to understand how it all works. Aren’t those electromagnetic sensors expensive and complicated for use in underwater weapons?

Answer: Commercially available (COTS) magnetometers are available at very small cost, size and power consumption which makes them suitable for use also in “home-made” weapons. Accurate electric field sensors require low noise electronics but a simple sensor that can detect a rusting ship can be made with two metal plates and cheap voltmeter.

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