BV uses the DYNAPOS notation family (e.g. AM, AM/AT, AM/AT/AS). What additional dimension do the "AT" and "AS" suffixes add beyond the core redundancy class?

A. They specify additional requirements relating to position-keeping accuracy and automated systems (AT — automated thruster control standards; AS — additional autonomy/automation features) layered on top of the base redundancy classification, rather than redefining the redundancy level itself

B. They have no defined technical meaning and are assigned arbitrarily by the surveyor

C. AT and AS only apply to vessels under 500GT

D. They downgrade the vessel's redundancy level compared to the base AM notation

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D. IMO Equipment Class has been superseded and classification societies no longer reference it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