the distance between the vertical line passing through the most prominent part of the hatch coaming on the side deck side and the vertical line passing through the inside edge of the slip guard (guard-rail, foot rail) on the outer side of the side deck;
razdalja med navpično črto, ki gre skozi najbolj vidni del odprtine žrela na strani bočne palube, in navpično črto, ki gre skozi notranji rob zaščite pred zdrsom (varovalna ograja, ograja v višini gležnjev) na zunanji strani bočne palube.