But it did not last long. Captain Bob Arnott (most famously of the QE2) describes what happened in his book, Captain of the Queen:
When he retired, Geoffrey quickly became bored and generally disenchanted with life ashore. And after a Cunard career culminating in command of the great Queens, he signed on as second mate of a banana boat. His fellow officers on the West India freighter knew all about their second mate's illustrious past, and used to call him "The Commodore."There may have been a reason as to why Marr chose a banana boat.
After graduating from the training ship HMS Conway in 1924, his first job was with a company called Elders and Fyffes - "banana specialists," as the Commodore called them. It seems possible that perhaps his new, post-Cunard assignment reminded him of his earliest days at sea. But this is purely speculation on my part.
References: Captain Robert Harry Arnott, Captain of the Queen: The autobiography of the most famous sea captain of them all. (London: Quadrant Books, 1982), 126.
Commodore Geoffrey Marr, The Queens and I: The Autobiography of the Captain of the Queen Mary and the Last Captain of the Queen Elizabeth (London: Adlard Coles Limited, 1973), 13.