In nautical tradition the bathroom/toilet is referred to as, "the head". A sailboat is on course when it is pointing towards it's heading; ie; the pointy end, up front, generally going towards where you want to go.
The reason one should do ones business up front (rather than the back) is because the waves will wash the bow clean. If you poop off the, "poop deck" the nasty bits follow you for your whole voyage.
In a sailing ship of yore there was actually seating forward at the head.On the Peggy G one balanced on the rail and held on to a handrail across the back of the deckhouse. I almost lost it when the rail came loose out of the rotting wood. It was a “roach boat” that got its crew by scooping up the waterfront winos and taking some first timers like me. The other beardless youth (a Creek Indian from Alabama) were tasked before we shoved off with shanghaiing a cook out of a fisherman’s bar. We bought him whiskey until he passed out then we got help from a couple of big guys standing at the bar to load him in the back of the captain’s truck (he weiged 350 or so).He woke up at sea and was content.