Question! I have done Whitney a number of times and the trail is fairly easy to follow. However! It is always good to have a map, of course. But the basic map available at REI is fairly useless. Does there exist a more zoomed in map of the trail from Portal to the top?
Go to Caltopo.com: https://caltopo.com/map.html#ll=36.57529,-118.26302&z=15&b=mbt&o=mbt&n=1&a=c%2Cmba
There are many options as to what can be shown. Hover over the top right corner, and more options will be revealed.
Print as you like.