Class I DP (DP1)

DP equipment Class 1 (DP1) is the lowest IMO dynamic-positioning redundancy tier: a single fault in any active component (thruster, generator, control, reference) can cause loss of position, because no redundancy is required. Defined in IMO MSC/Circ.645 (1994) and the updated MSC.1/Circ.1580 (2017), DP1 suits operations where drift-off carries low consequence. It contrasts with DP2, where no single active-component failure causes loss of position, and DP3, which adds physical separation against fire and flood. Class notations DPS-1, DP(CM), or AUT-equivalents map to this level.