EM's are responsible for the operation of a ship's electrical power generation systems, lighting systems, electrical equipment and electrical appliances. The duties include installation, operation, adjustment, routine maintenance, inspection, test and repair of electrical equipment. EM's also perform maintenance and repair of related electronic equipment.

Aviation Electronics Technicians (AT) troubleshoot and repair digital computers; fiber optics; infrared detection; radar systems; electricity generation systems; laser electronics; navigation systems; communications equipment; electrical power distribution; pressure indication systems; electric transformers and circuits, employing the latest test equipment and procedures. Knowledge and skills also include equipment operational checkout, corrosion control, scheduled maintenance, and component removal/repair/replacement.