Za obstoječa plovila se sme V začasno oceniti po formuli: V = a3 (Loa B1 T1), kjer je: a3 = funkcija Loa, B1, T1 in leta izgraditve. Funkcije au a2, in a3 se določijo na podlagi statističnih analiz zbranih reprezentativnih vzorcev flot držav članic.
F or existing vessels, V may be provisionally estimated by the formula: V = a3 (LoaŔ B1Ŕ T1) where: a3 = a function of Loa, B1, T1 and year of construction. The functions a1, a2, and a3 will be fixed on the basis of statistical analyses of pooled representative samples of the fleets of the Member States.