It's a good learning tool, though, and I printed one copy full size and another at 50% (4" H x 3½" W, so actually ¼ size), which is still readable (with my glasses) and you can tape it on the side (top) of the guitar. and by cutting off the top and bottom labels it's down to 3" high.Larry, great link. although I can't imagine printing it out, and carting around. One easy way on the dobro in open G tuning is :key, up 5 and up 2. Then to figure out when and how to use a capo. The banjo is typically tuned to open G as well, so for early in picking bar chords work great.
I'll likely never learn it all, but even just knowing the 145 in 3 or 4 common keys makes a difference.