When we moved aboard Halcyon I promised El she would never have to dump the porta potti - and she hasn't. We had the good fortune of returning from Hawai'i with a menehune hiding in our suitcase. When I left the case on the boat the menehune apparently jumped out and hid. We've had him aboard ever since - and what a help he is. When he deems it necessary, the porta potti gets dumped. So El doesn't even have to witness the dumping.
Next time you go the the Islands whisper a few nice words on the night wind, mention an unlimited supply of mai'a in return for a few favors, and the 'little one" might take a shine to you, your boat, and the potti.