i have worked with part 1 s offshore ,and can think of atleast one who was core crew 2 on 3 offhave qualifications and get phoning companies, send CV in. bit extreme but it helps to live in Aberdeen ( North sea ) you will need at least part 2.
definetly a part 1 made up to core crew mate . although i suspect he had relatives in high positions .They may have put a core crew member through his part 1, very much doubt you would get offshore with a part 1... especially in this climate......