It may be possible somehow to detect radio waves, radioactive emanations, magnetic fields, and the like.

Electroreception (or electroception) is the ability to detect electric fields.

However, in general humans (and it is presumed other mammals) can detect electric fields only indirectly by detecting the effect they have on hairs.

Some organisms can detect magnetic fields, a phenomenon known as magnetoception.

The species is able to detect geomagnetic fields and uses them to navigate while migrating.

They can detect electric fields as low as .75 uV/cm.

He smiled inwardly to his star brother Did you know that sharks also can detect electromagnetic fields?

They contain special kinds of semiconductors treated with superconducting material that can detect minute magnetic fields.

This compact sensor detects magnetic fields for navigation and works on all three axis.

Still other sensors can detect magnetic fields generated by electrical gear in tunnels up to 100 feet deep.