Electronic mechanic includes jobs involved in the assembly , fabrication’ overhaul, installation, maintenance, and repair of various fixed, semi fixed, ground, airborne, and marine electronic equipment such as communication equipments like radio, cryptographic , sonar, navigational aids, and related devices . This work requires a knowledge of the practical application of operating electronic principles, the ability to determine malfunctions, and the skill to perform proper maintenance and repairs to a variety of electronic equipment.