Before revision: If the depth was at a mark he would call "by the mark" followed by the number, while if it was between two marks, he would call "by the deep" followed by the estimated number; thus "by the mark five , " since there is a five-fathom mark, but "by the deep six , " since there is no six-fathom mark.
After revision: If the depth was at a mark he would call "by the mark" followed by the number while if it was between two marks,, he would call "by the deep" followed by the estimated number; thus "by the mark five , " since there is a five-fathom mark, but "by the deep six , " since there is no six-fathom mark.