Repair and regulate electrical and mechanical equipment of inboard or inboard-outboard boat engines. Repair, take a look at, modify, or set up electronic gear, similar to industrial controls, transmitters, and antennas. Excludes “Avionics Technicians” ( ), “Electrical and Electronics Installers and Repairers, Transportation Equipment” ( ), and “Electronic Equipment Installers and Repairers, Motor Vehicles” ( ). Place and detonate explosives to demolish constructions or to loosen, take away, or displace earth, rock, or other supplies. May carry out specialized handling, storage, and accounting procedures.