I do know it was not until I ended up ashore that I found this strange object that I had to carry around with me all the time. Do not know how many I lost before I realised that you have to remember to put it on a ring with many others. It is called a "key". I have been trying to recall if I ever had one on board and if I did then dementia is setting in.
That's the way the mop flops.
My thanks to Brian for this site.