Use of an iPad

I understand where and who can use technology, such as an iPad, but to what extent can an iPad be used? Are coaches allowed to take pictures or videos and review them during a game or at halftime? What I would like to do is have my coaches in the press box to take a picture of how our opponent lines up to our formations. I would then like to have the coaches verbally relay to me their alignment. Please advise me if this is legal.

What you describe below is perfectly legal. The only restrictions are showing any of this to a player inside the 9 yard marks.