Ok, I'm guessing there have already been hundreds of posts about bogs on boats. My first was a bucket in the engine room. I have to say, it was something of a reverse bird-puller. She was not impressed in the morning after the night before. Then Porta Potti. Great, having to re-examine the proceeds of everyone's diet for the last n days. Nah. Then pump-out, dump-thru style. Yuk, the stink! Then 'proper' pump-out, with a super-duper macerator toilet. Why do those things only have an outlet hole in the pan of about 1" diameter?? Come on, without getting too gross, a sizable deposit is not going to fit down there too easily!
Then on to the 'eco-friendly' composting bog. Great idea, but do you really want to have buckets of poo, in varying degrees of decay, dotted around your boat, like some weird Andy Warhol art effort?
Then there are all the issues about the availability of disposal facilities, be that 'Elsan' or dump-out. Plus the cost. Why can you never find a working pump-out facility when your tank is full to the brim?
There is only one answer, folks. Burn it. You will never seek out a pump-out or Elsan point ever again!! (I have the feeling that barbecued sausages will never quite be the same, though )
If you are still in any doubt, watch this video: