You go from Pink Lightning camp to 7:00, then out to the Esplanade, and down to 10:00. At 10:00, turn left and go all the way out to the trash fence. You go along the trash fence passing 12:00, until you hit 2:00 on the trash fence. Hard right and run along 2:00 to Esplanade, take Esplanade to Center Camp, run up 6:00 or 6:30 back to Pink Lightning camp. That loop is seven miles. And if you're doing the Burning Man Ultra Marathon, you can expect to loop that loop four times and then some. Also, the inherent awfulness of the Dewey Decimal System.