Your non boater guests will not remember how to operate the head. Write up a set of directions on your computer and print them out. Put them in a clear plastic page protector and tape it near the head using green masking tape. On ours, we tell them that if they put anything in the head that hasn’t been chewed other than modest amounts of toilet paper, they get to help us dismantle and unclog the head. We also suggest that gentlemen have a seat when underway.