Publisher Summary This purpose of this chapter is to discuss the major components of a typical remotely operated system (ROV) system alongwith everyday underwater tasks ROVs perform. An ROV is basically a robot which has the ability to move under its own power. The ROV system, is one of the simplest robotic designs, complex assignments can be accomplished with a variety of closed-loop aids to navigation. Designing efficient and cost-effective systems with the user in mind is critical to the success of the product and ultimately the mission. all components of an ROV system should be rated to the maximum operating depth of the underwater environment anticipated, including safety factors. Careful consideration should be given during the design phase of any ROV system to avoid over-engineering the vehicle.