The sailor is able to transfer directly from a wheelchair and ride in the boat into the water. The keel lowers as the boat and trolley moves into deeper water. The trolley is ballasted to stay on the bottom. It has tall stanchions in each corner which position the boat.
When the boats return to the trolley, the keel locates in a funnel shaped trough so it is positioned in the centre and trolley, boat and sailor can be brought ashore as one.