It looks rather different from the boat that will carry the Queen down the Thames in this weekend's Diamond Jubilee celebrations, but today HMS Hurworth is acting the part of the Royal Barge.
The Royal Navy is practicing its formation for the Royal Guard, which will accompany the Queen's boat down the river on Sunday.
Ten naval vessels will surround the Royal Barge, while almost a thousand other boats will take part in the procession.
An investigation has been launched into how unpaid workers bussed into London for the Diamond Jubilee celebrations were left stranded.
The Archbishop of Canterbury Rowan Williams spoke of the Queen's lifelong dedication to her people, her country and the commonwealth.
The Queen has a packed schedule on the final - and climactic - day of the Diamond Jubilee weekend.