local government unit (lgu) of palawan, page-38

READY STACKED
Ready stacked status means that a rig is idle but operational and is also referenced in the industry as warm stacked. A ready stacked rig typically retains most of its crew and can deploy quickly if an operator requires its services. In a ready stacked state, normal maintenance operations similar to those performed when the rig is active are continued by the crew so that the rig remains work ready.

Daily operating costs for a ready stacked unit remain close to the levels incurred when the rig is actively working. Thus, a rig is kept in a ready stacked state when its owner anticipates that the rig will be able to return to work shortly - either due to having a commitment in hand or the owner's perception that work will be secured relatively quickly. Ready stacked rigs are actively marketed and considered part of marketable supply.