Ok, I looked a few times at the jink, I just can't see what you're refering to. I did notice one thing that corresponds, his rear wheel just touches a white cone as he's about to exit the jink, is that what you mean ? I looked for tape on the ground, and strung between the cones, but can't see it. :)
Going to do a little sliding today as soon as the temp gets above freezing. Wooohoo !
Yes, Android AND iphone GPS works without cellular data. Use offline maps and enjoy. (thanks drtbyk!)