Boat trips on the Greta - The historic Thames sailing barge Greta was launched in 1892 and was one of the Dunkirk ‘Little Ships’. It is the oldest working ship of all the Dunkirk little ships. The Greta trips start from Whitstable Harbour around the Thames Estuary. The crew can sail while you sit back and relax, or you can, with the permission of the skipper. With her 90 foot mast, this is a boat trip with a difference. Subject to availability and the weather, the Greta can be booked on most days for individuals and be chartered for up to twelve passengers.