I am in the process of purchasing an older fishing trawler and bringing her into the great lakes. I had planned on setting a commercial porta- potty on deck while we replumb her to an MSD and holding tank system. Now I think I will do more investigating with the coastguard prior to picking her up. Kurt Jensen Columbia 81 ft trawler. Hi Fred ! M.W.B. President & CEO CSI Explorations INC. komoron@yahoo.com 1-715-529-7800 1-715-830-8445 FX U.S.A.