I can't seem to get the straight scoop. My Burns does not have a holding tank or treatment system of any kind. When I read the info online DNR states that sewage discharge laws do not apply to boats built before 1977, mine is a 1976. Then on the next line it reads all boats since 1980 and boats before 1976 need MSD1,2 or 3. I want to install a purisan but do not have time before our planned cruise in two weeks. Oh, and to add to the confusion the old guy at west marine told me I was legal as is. Anyone know for sure?

Rob