How often are the turns?
For much of my touring, I won't have much in the way of turns, except perhaps occasionally crossing a city. So checking either paper maps or computer the night before, I can often write down some descriptions on a note card to use with my handlebar bag. In those tricky city situations, I've been able to augment things with a quick check of tablet and offline maps. However, you might be in situation with a lot more turns than I typically have...