The vertical mark on a compass bowl to mark the ship's heading. To 'chase the lubber's line' is to be unable to hold a steady course.
Luphawu oluthe nkqo olufumaneka kwisitya sesalatha ndawo ukuphawula isikhokelo senqanawe. Ukuleqa uphawu oluthe nkqo kukungakwazi ukubamba nkqi into.