Place all trash in proper containers. Do not throw anything overboard. It may create a hazard for other watercraft or marine life. A no smoking policy should be maintained while on board watercraft. A fire on board while at sea poses a serious hazard.
Marine toilets are very delicate.
It does not take much to damage them beyond what can be repaired at sea. DO NOT dispose of tampons, paper towels, or other objects in the marine toilet. They may damage or clog the toilet. Point in the direction of that person. DO NOT take your eyes off that person.