I am aware of one toilet facility, built by the NWS, at a wildlife management area. It was about 150-ft from the edge of a tidal grass flats area. From what I recall, it was a permanent structure, with some form of chemical composting system beneath it. The structure was permanent and made from masonry. This specific amenity was close to where Hurricane Idalia made landfall in 2023. Anecdotal reports are that much of the infrastructure down there was destroyed or heavily damaged by the storm surge, so (permanent or not) I do not know if it survived. Being so close to the shore line, I doubt they could do a typical pit or vault there. Even a septic tank with drain field may have been difficult.

Something I just learned, is to put the full (expanded spelling of suffixes) in addr:street, but use the abbreviated (common local use) in addr:full. The prior is more easily parsed, but the latter is not expected to be parsed.

OK, now using JOSM. Takes a bit getting used to, but seems to do an OK job. Still having an issue locating correct marker types for agriculture facilities. Using commercial for the time being.