Lightvessel No. XVII Gedser Rev is a decommissioned lightvessel built in 1895, now serving as a museum ship in the Nyhavn Canal. It is owned by the National Museum.

During the Cold War and after the building of the Berlin Wall in 1961, many East Germans chose to escape by water, heading North to Denmark. Although most failed and many died in the attempt, at least 50 were rescued by the Gedser Rev. As the Southernmost limit of Danish territory and as an obviously recognisable target, many aimed for the lightship. One notable escapee was Manfred Burmeister in 1969, who escaped by aid of a petrol-driven submersible scooter.