Hi everyone, I noticed that this thread seemed to get a little off topic with the legality aspect of using tablets in place of physical charts. Now that we clearly know its legal, does anybody use one to actually replace your charts? Also I think there is some misunderstanding with the original question about batteries 'failing.' Failing and dieing are two different things. While lit-ion have been know to 'fail' (not to ever work again) it is rare. While your battery will generally die within 4 or so hours of heavy use. So in other words do you have auxiliary power for your pad? Thanks