I've been full timing now for 2 years and driven all over the country. I have a dedicated 7 inch RV GPS mounted on the dash. And I also have an Iphone.
Let me first say that I love Google Maps - none better IMHO. And I have occasionally used it's GPS features too. BUT, when I'm pulling my 35 ft fiver down I-75 in traffic and lining up to go through Atlanta, there is just no way that a small phone screen is better then a 7 inch GPS screen.
I need to periodically glance at the screen to get early warning on when my interstate merges and unmerges with other interstates and also to know whether I will be exiting on the left or right side. That is why these things are golden.
I also get lots of other info with that same glance too - current speed and speed limit, current Mile Marker location as well as distance to the next turn, destination ETA, etc. It's all right there on that nice big screen.
The smart phones we have today are really just small computers with a phone capability and that's great. But until I can set one in a cup holder and have it project a heads-up GPS view onto my windshield, I will be sticking with my full-featured, dedicated, large screen GPS.
My .02
Tim
