According to the Canadian poster at trailerSailor, the national regulation about all installed toilets in pleasure craft requiring a pump out through a deck fitting just went into effect May of this year. Created quite a stir at that site as most of the little wannabe cruisers have completely self contained systems of one type or another; adding plumbing is a big deal. Mine has the most basic kind there is; pretty much a bucket with a seat (and an outer container that is nearly air tight). The interesting thing is that there are new biodegradable bags for these now that are supposedly more environment friendly than any treatment method and they contain the odor remarkably well. I guess their concern is that it is just way too easy to discard the bags improperly (oh yeah, the new bags also claim to have something in them that makes it not a biohazard) or to pump out into the drink (but you'll think twice about that if you have to sqeegee it off the deck).
Newport 17 - "Kohanna"
At sea Darwin's hypotheses is the final arbiter of right of way.