The adoption of large centre-line hatches, or of two or even three rows of hatches side-by-side, has produced what are termed "open ships".
Ukwamkelwa ngokusemthethweni kwamacango amakhulu ezangqa zemigca, emibini okanje emithathu yeminyaka kumacala ngamacala, kwenze into ebizwa ngokuba zinqanawa ezivulekileyo.