Definition(s)
Dynamically Positioned Drilling Vessels
Drill ships and semi-submersibles drilling rigs equipped with computer controlled thrusters, which enable them to maintain a constant position relative to the sea floor without the use of anchors and mooring lines while conducting floating drilling operations.
Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards