Loose Ends

Aren't they all:
1. Marion Lochhead Corbett 1844 - can't find anything on her death and can't wait for the Scots to realease the 1911 census (2012)
2. Obadiah Clark 1858 - need to figure out how to search seamen
3. Obadiah Clark 1836 - Corporal in the Royal Artillery - has kids born in England, Scotland and India - how do I check this?

I decided "loose ends" are only the 19th C people at this point. Everyone else becomes a loose end as we go further back but Marion and the Obadiahs should be findable. I have bought
My Ancestor was a Merchant Seaman: How can I find out more about him? by Christopher T and Michael J Watts (London: Society of Genealogists Enterprises, 2004) but all the records seem to be in England or Newfoundland.