I find my iPad is one of the most useful tools I have when cruising. My favorite boating apps are iNavX,Active Captain, TideGraph, and Boat US. Acrobat reader is great for cruise logs, and I have all my manuals ( Lehman, Onan , and electronics saved there.I also have bookmarked the NOAA weather site and any marina's website that I intend to use on the trip.
I don't have the cellular model but I use a Dual bluetooth GPS for navigation and my iPhone hotspot for internet while on the water.
Ram makes a great mount that folds out of the way when not in use.
Have fun with your new toy.