DP — Class Notation Practice Questions

A. They are entirely unrelated systems with no correspondence between them

B. Only IMO Class matters; classification society notations are purely marketing labels with no technical content

C. IMO Equipment Class is the regulatory baseline defining the level of redundancy and consequence of failure; each classification society then issues its own branded notation that corresponds to (and may add detail beyond) the equivalent IMO class, so a DNV DYNPOS-AUTRO broadly corresponds to IMO Class 3 but with society-specific requirements layered on

D. IMO Equipment Class has been superseded and classification societies no longer reference it

A. "R" denotes redundancy — the vessel has redundant equipment and machinery arranged so that no single failure causes loss of position-keeping capability, broadly equivalent to IMO Class 2; AUTS denotes a single, non-redundant system, broadly equivalent to IMO Class 1

B. These notations only apply to anchor-handling vessels, not other DP vessel types

C. "R" stands for "rated power" and has nothing to do with redundancy

D. AUTS has more redundancy than AUTRO; the letters are unrelated to redundancy levels

A. Classification society only matters for hull and machinery, never for DP-specific requirements

B. Yes, IMO Class 2 means identical requirements regardless of classification society

C. The classification society is chosen by the flag state and has no bearing on DP requirements at all

D. Not necessarily — while both meet the same IMO baseline, each classification society's specific rules, survey requirements, and documentation expectations can differ in detail, so the DPO should check the vessel's actual class certificate and FMEA rather than assume practices transfer directly between class societies