Noble Corporation plc is one of the drilling contractor for the oil and gas industry. This company is performing contract drilling services with its global fleet of mobile offshore drilling units. As of December 31, 2016, the Company’s fleet of 28 drilling rigs are consisted of 14 jackups, eight drillships, and six semisubmersibles. The Company’s drillships are self-propelled vessels. These units are maintaining their position over the well through the use of a computer-controlled dynamic positioning system. As of December 31, 2016, its drillship fleet is consisted of four dynamically positioned Gusto Engineering Class drillships, two dynamically positioned Bully-class drillships, and two dynamically positioned Globetrotter-class drillships.