I have an iPhone and have used Google maps. Works good when it doesn't tell me I'm not connected to the internet. But for RV travel I like my Garmin in sight where I can tell how far to the next change, some idea for what lane to be in, distance and time to destination, current speed, speed limit etc. Also, the in-dash GPS seemed to have a learning curve that I wasn't interested in pursueing since I have diffenent GPS systems in my car, my jeep, my phone and my Garmin. I think the biggest issue was visibility along with switching between functions while driving. Now once in town trying to find a restaurant or other places, it's hard to beat the phone. In that instant, 99%+ of the time, I'm in the toad. Also, the big issue with not having a full time rearview camera display is being able to to know when it's save to pull back into your lane when passing since you can't see the toad in your mirrors.
