HomeCalculatorsSubdivision - Attained Index A

Subdivision - Attained Index A

Attained subdivision index A from partial indices at three drafts - ds (deepest), dp (partial), dl (lightest) per SOLAS II-1 Reg. 6.

SubdivisionA indexSOLAS
Attained A
0.7660 -
Margin vs R
0.0660 -
Formula, assumptions, and limits

A must be ≥ R (cargo) or A ≥ R (passenger ship, with N-dependent R). Each A_i = Σ p·s·v over all damage cases at that draft.

Symbol legend

SymbolMeaningUnitSource
Attained at deepest subdivision draft - Reg. 6 calculation
Attained at partial subdivision draft - Reg. 6 calculation
Attained at lightest subdivision draft - Reg. 6 calculation