He thinks hard and peeks around a stall to look down one of the paths to try to find a familiar landmark. He sees the jousting field.

Then he points to where the sun set in relation to it.

"It set that way."

He points at it with his left arm straightened, and holds out his right arm at a right angle, also straight.

"Okay, so that's north."

He'll turn out to be right. He's got good a good memory.