Encyclopedia
Length
i) «Length» (L) is taken as 96 per cent of the full length on the waterline at a height of 85 per cent of the minimum theoretical height of the deck, measured from the keel line, or the length from the forward edge of the stem to the axis of the rudder stock on the same waterline, if this length is greater. On ships designed with trim, the waterline on which this length is measured must be parallel to the structural waterline;
Source: ILO Convention No. 188 on Labour in the Fishing Sector