Sentence:  I was so happy on board that ship, I could not have believed it possible. We had the beastliest weather, and many discomforts; but the mere fact of its being a <WSD>tramp</WSD>-ship gave us many comforts; we could cut about with the men and officers, stay in the wheel-house, discuss all manner of things, and really be a little at sea. 
Meaning of the word marked with <WSD> tags:  Any ship which does not have a fixed schedule or published ports of call.