All RCI ships are in US$ irrespective of where they are.
Onboard it is all us dollars which is good at the end of the cruise you can pay your bill by credit card and opt for which currency you want to pay in but I would suggest that you stick to dollars because of the exchange rate - they will only take cash in us dollars.
Royal Caribbean - Independence of the Seas - 28 Apr 17 - 3nts
Southampton : Bruges (Zeebrugges) : Paris (Le Havre) : Southampton
Now from £399pp - Promenade View
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Royal Caribbean - Vision of the Seas - 23, 30 Jan 17 06, 13, 20, 27 Feb, 06, 13, 20, 27 Mar 17 - 7nts
Dubai : Khasab : Muscat (Oman - Overnight) : Abu Dhabi : Dubai (Overnight)
Now from £749pp
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Royal Caribbean - Independence of the Seas - 14 Oct 17 - 7nts
Southampton : Gijon : Bilbao : Cherbourg : Paris (Le Havre) : Southampton
Now from £755pp
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