Frances, do you have info in Manx Notebook about this? I have found a relative who's 'street address' is given as 'True Blue', and he's described as a fisherman (along with dozens of other names) I assumed True Blue to be the name of his boat, and he's described as working for Kinsale Fisheries 2. I'd love to find out more about Kinsale and the work done there.
Also, to further 'muddy the waters', I have a relative described as 'sailor' - is this different again to mariner, and I also saw a 'seafarer' - are these just different ways of describing the same occupation?
Maggie