New Zealand experienced a resurgence in sailing in the 1970s. This song, written by Rudy Sunde, leader of The Maritime Crew, describes a rough trip from one New Zealand port to another. From the New Zealand Folk Song index,

Auckland has two harbours, Manakau on the west, giving access to the Tasman Sea, and Waitamata on the east, giving access to the Pacific Ocean. Bluff
is a harbour near Invercargill at the bottom of the South Island. You could sail from Auckland 36o south to Bluff 47o south from either harbour, but the Tiri light marks the entrance to Waitamata harbour, so the Rudy's mythical Flora Belle sailed down the east coast, right through the stormy "Roaring Forties."

The song has been recorded by The Maritime Crew, Charlie Ipcar, and Rudy Sunde's group on the 1986 album Chants de Marins de l'Irlande au Pacifique (Sea Shanties: from Dublin to Auckland), among others.