On Monday I had an appointment set-up by my broker with the real listing broker to view this boat. We were instructed to meet Capt Bob and he would unlock the boat and provide any help that might be needed. Capt. Bob did just that, what a great individual. (Retired ferry Capt. from N.Y. Harbor and 30 year close friend of the owners. During the inspection I heard some very loud conversation from the wheelhouse area. I went to see and Charlie from Red Line Marine had come aboard uninvited and was yelling at my wife asking what we were doing aboard HIS boat. I entered the conversation at this point and intercepted all of his threats asking if he was in fact the new owner. He repeatedly said that he was. At this point Captain Bob enterened the conversation stating that he did not buy this boat, nor were there any contracts written for the purchase for this boat. At this point Charlie changed his story and said he was going to buy the boat. Subsequently, he again changed his story and said that he was going to sell the boat as a favor for the owner. At this time, I asked Charlie that since he did not own this boat, have a contract on this boat, or a legitimate listing, to please get the hell off. He continued his rant for a few minutes and at this point he obviously decided better and left. I finished inspecting the boat and along with my broker, left for the evening. On the ride home, Captian Bob, contacted the owner and the owners daughter informing them of what had taken place. Captain Bob was told that if Charlie from Red Lion Marine stepped foot on the boat again to have him arrested. My broker, the owner of Maryland Yacht Sales contacted the listing broker and he is following up with various complaints to YW where an unapproved listing of this boat appears. The boat itself appears in need of cosmetic and mechanical maintenance on several issues because of non use and attention at this point. On a scale of 1 to 10, it is probably a 7 to 7.5 at best. The owner of Maryland Yacht Sales, also a member of this forum, conducted himself professionally and with restraint as the situation became quite heated between myself and the owner of Red Lion Marine. Subsequently, the owner of the vessel contacted my broker personally and appoligized for the situation and promised action on her part. At this point, we intend to pursue possible purchase of this vessel without any further interruptions or instigation by the owner of Red Lion Marine.