Discussion about additional dump station types is underway at:
http://wiki.openstreetmap.org/wiki/Talk:Tag:amenity%3Dsanitary_dump_station#Try_Three
And on the Open Sea Map forum.
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A recent proposal I promoted turns out to have a flaw.
It's amenity=sanitary_dump_station. Despite fairly extensive
discussion on this list, apparently nobody with a boating background
had a good look at the proposal. The flaw only came to light as
tagging started.
Can you figure out the flaw?