Will you have a handlebar bag with a map case on it? I REALLY like having a paper map in my map case that is easy to refer to. A plastic case that keeps 98 percent of the rain off the map is nice to have.
I admit I have some bias here, I am a retired Geological Engineer, I worked with maps almost every day of my professional career, thus I probably over emphasize the importance of knowing where you are and where you are going and what is in between.