An old tanker will do just fine for that purpose.

With Naval escort to GITMO

Sure, All the mariners on board told me that they wouldn't influence me with their stories and would wait until the week I would leave to regale me their ghostly tales of working on board. I remember scoffing and focusing on my job dismissing all teasing thinking they were just trying to freak me out. Not even a week into my hitch, I had walked into the small surgery room adjacent to the large galley that I felt the presence of evil. I had a feeling that can only be described of a thousand bee stings and the feeling of your stomach on a rollercoaster all at once. Ran all the way back to my room to pray so hard. I approached the second engineer at the time and demanded that he tell me his story. His story corroborated my story. Then the captain joined in and said that not all the ghosts were bad though. One had saved him from falling in the deep chasm of an open door on the deck. Found out from one of the Navy officers that there is a little girl, who will wake you up at night to play. And that when the ship was in the drydock, the workers would read from the Bible as they completed their jobs. Haunted AF

HMS: Royal Navy
HMCS: Canada
HMAS: Australia
HMNZS: NZ
HMJS: Jamaica
HMBS: Bahamas, Barbados
HMPNGS: Papua NewGuinea
etc..

The N is for Naval, not Navy. Not the same thing. They are normally crewed by Merchant Marine.

But again, that's being very pedantic, like the fact that a USMC officer is an American Naval Officer, but not an American Navy Officer.