A toilet on a boat is called a head because it was historically placed at the front of the boat.
You’ll still hear folks say “hit the head” referring to using the restroom.
You’ll still hear folks say “hit the head” referring to using the restroom.
30 degrees should be enough to prevent toxic hazards. Sitting on the head on a tilting ship, during upwind sailing, is prone to other hazards though.
[1] https://history.stackexchange.com/questions/56264/when-did-h...