You turn me on when you're feeling low I take the flood so you don't overflow

X marks the spot, though that doesn't mean much, as who tracks hidden treasures, with no hidden hack?

I turn and turn showing the way Many lands on me I show Could see them all in one day Oh, the places you’ll go!

I'm thin, sharp, and hard to find among a stack of hay.

I have legs but cannot walk, a face but cannot talk. Many gather 'round my girth, for feasts and games and scholarly mirth. What am I?