chaH tlhapta' 'abmey, je tu'ta' cha'maH fathoms. { Note: 20 fathoms = 120 qamDu' = 36.6 meters } After a mach qaStaHvIS, chaH tlhapta' 'abmey again, je tu'ta' fifteen fathoms. { Note: 15 fathoms = 90 qamDu' = 27.4 meters }