Training course?

Is there any training course available for the understanding of underwater signatures and their use for weapon fusing?

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Is the knowledge about underwater signatures generally the same among the coastal states around the world?

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Distance trigging?

Isn’t an underwater weapon triggered from some distance by a magnetic field less effective than a hit by a mine that explodes by direct hull contact?

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Some pictures shows large naval ships covered in a web of cables for a process called “deperming”. Is this procedure removing all the magnetism from the ship?

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Electromagnetic sensors

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

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Rusting ship sensor

Is it true that there are sensors that, from a distance, can detect that a ships is rusting?

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Is the magnetic field from a ship really detectable in the noisy background of the geomagnetic field?

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