Charts on iPad?

Anybody putting visual charts on an iPad or some other device and using that at the telescope?  Maybe I'm a johnny-come-lately to the technology, but I was just out taking my first shot at a couple of the new binocular program stars, and using Distant Suns on my iPhone to find the fields, then entering the observation into the AID on the spot using my iPhone again.  It crossed my mind that charts on an iPad could render the whole thing paperless and less hassle.

I think I'll try saving the charts to my iPhone, and see how workable that is.

Just wondering if anyone else was doing anything like that.

Jim