Vessel 2 was tied to a dock; the Owner/Operator of Vessel 1 was having trouble docking and gave the helm to another Occupant aboard Vessel 1 to attempt the docking.  The Occupant, now the Operator of Vessel 1, had never operated a vessel with a manual transmission such as that found on Vessel 1 and, as a result, as Vessel 1 appeared to be geting too close to Vessel 2, the Operator of Vessel 1 put Vessel 1 into what he thought was forward and gave Vessel 1 gas.  In reality, Vessel 1 was in reverse and the Owner of Vessel 1, who was now standing on the swim platform when Vessel 1 struck Vessel 2, struck Vessel 2 and broke his arm.
Lakeside                      