▁possible . ▁ ▁To ▁have ▁sufficient ▁redund ancy , ▁enough ▁gener ators ▁and ▁thrust ers ▁should ▁be ▁on - line ▁so ▁the ▁failure ▁of ▁one ▁does ▁not ▁result ▁in ▁a ▁loss ▁of ▁position . ▁This ▁is ▁left ▁to ▁the ▁judgment ▁of ▁the ▁D P ▁operator . ▁For ▁Class ▁ 2 ▁and ▁Class ▁ 3 ▁a ▁Conse quence ▁Analysis ▁should ▁be ▁incorpor ated ▁in ▁the ▁system ▁to ▁assist ▁the ▁D PO ▁in ▁this ▁process . ▁ ▁The ▁redund ancy ▁of ▁a ▁D P ▁ship ▁should ▁be ▁jud ged ▁by ▁a ▁failure ▁mode ▁and ▁effects ▁analysis ▁( F ME A ) ▁study ▁and ▁proved ▁by ▁F ME A ▁tri als . ▁Besides ▁that , ▁annual ▁tri als ▁are ▁done ▁and ▁normally ▁D P ▁function ▁tests ▁are ▁completed ▁prior ▁to ▁each ▁project . ▁ ▁D P ▁operator ▁The ▁D P ▁operator ▁( DP O ) ▁jud ges ▁whether ▁there ▁is ▁enough ▁redund ancy ▁available ▁at ▁any ▁given ▁moment ▁of ▁the ▁operation . ▁I MO ▁issued ▁M SC / Circ . 7 3 8 ▁( G uid elines ▁for ▁dynamic ▁position ing ▁system ▁( DP ) ▁operator ▁training ) ▁on ▁ 2 4 - 0 6 - 1 9 9 6 . ▁This ▁refers ▁to ▁IM CA ▁( Intern ational ▁Marine ▁Cont ract ors ▁Association ) ▁M ▁ 1 1 7 ▁as ▁acceptable ▁standard . ▁ ▁To ▁qual ify ▁as ▁a ▁D P ▁operator ▁the ▁following ▁path ▁should ▁be ▁followed : ▁a ▁D P ▁Ind u ction ▁course ▁+ ▁On - line ▁Ex am ination ▁a ▁minimum