I do a lot of traveling with my iPad, so I created a way to mount it in the center dash compartment with only a minor modification. I use the GPS function for route info since I try diffent ways of traveling. Since driving in some areas is lousy for radio reception, I found a cable that would connect to the radio's input jack and a USB plug for charging. I can play music from the iPad tunes, and other things. One of my GPS programs even provides elevation readings when travelling through the mountains. Finally, I use Gas Buddy to plan the best places to get fuel.
My only problem is that the GPS programs are battery drains. No matter which charger I use, it will still drain on a long trip. With the 2 amp chargers, I can go all day without going below 40%, but if we do one of our 15 hour non-stop runs, we would need to turned off the GPS for periods to recharge. We also used the TomTom to find places to eat and Wal-Marts for rest breaks along the routes we take.