The arrow for the start of this climb is wrong. It actually lies up and left of this arrow on the higher ramp (apex of the greenery left of the arrow). Do remember to turn up and left halfway up the ramp, ascending a broken corner to gain the next ramp up. This terminates in the chimney described well in the route description.
A view of the Checkerboard Wall (and Maiden Voyage) from across the street at the Goss-Logan. The labeling and photo post is my attempt to share helpful info on this site. My route arrows are not exact.