You didn't say what truck you were buying, but most new vehicles' head units can interface with your phone via bluetooth or at least USB. If you load WAZE or google maps etc on your phone, just display it on your vehicle's screen. I do this with my new F350. Easy. I am surprised they still offer NAV with new vehicles. The Apps on phones are always up to date, you can change them, etc. the NAV in a vehicle is pretty limited in it's obsolescence and you're stuck with that one NAV.
On edit, why don't more manufacturers just offer integrated apps to work with tablets and further build in docking stations for tablets and phones? The stock head units and proprietary software for new vehicles is far inferior to the technology available after market. It's not dynamic and often becomes obsolete forcing the owner to replace the head unit anyway. My personal experience with my new truck is that the stock display and head unit is pretty limited. Ford could do better by making a docking station for tablets and phones and make apps that you can just load. Almost everyone buys a mounting bracket for their phone or tablet and displays on the head unit anyway.