I use my IPad Mini with a Nuuid water tight cover, downloaded a free version of Navionics. Gives me static charts, positioning, speeds along with bouy markers, and you can create waypoints and markers. I had to research it well. In order for it to work, you have to get the built in GPS. You have to buy a WIFI and cellular capable unit. You do not have to buy a plan, but they will ask if you were to use it later on a cellular plan, which service provider would you most likely go with. No problem with sun glare.