Did you want to be stinky, but the game just kept you clean no matter how hard you tried? This patch makes the gravship keep its pollution when travelling to a new map. You will also leave stinky ship prints wherever you take off from, which your neighbours won't appreciate. Landing on pre-existing pollution will still delete it, as per vanilla behaviour. Thought it'd be odd if you would pick up pollution by simply landing on it.
As a bonus, it lets you build the Toxifier Generator on gravship substructure.
Stay stinky.