I'm struggling to locate a relative from the mid-ninetinth century.
I received a marriage certificate for the marriage of John Ellison b.1860(my gg grandfather) and his wife Catherine Jane Lennon which took place in 1881 in Liverpool.
But unfortunately like John Ellison his father William's Profession is listed as a Mariner so going back through the census's is hap-hazard as I am constantly wondering whether William is away at sea on the night of the census's

And with no mothers name - I am finding it hard to pin down my William...
Do any resources where crew-listings for merchant ships or the like exist where I could trace my ancestor?
Any ideas??