Brad Gerlach and Mike Parsons pass the mic to Surfline's Chief Forecaster Sean Collins for the lowdown on the X Factor and other key points all surfers should know if they're trying to score the best surf. Meanwhile Taylor Knox and Pancho Sullivan rip the North Shore and Shane Dorian and Flea tow-in at Jaws and Maverick's. Edited from the Surfology 101 segment of Surfline's brand-spankin debut DVD, "Making The Call: Big Waves of the North Pacific." Buy it here. Music in the clip from Sciflyer and Frank Jordan. Post: November 17, 2003.