I tried the phone (google maps). Works, but no bridges or tunnels info. Tried our regular car gps, same issue. Bought POI's to load into google maps and our car gps. from lowclearence.com. Works but you have to load the POI's into your phone/tablet via excel. There is no way to ensure the POI's work other then looking at the custom map you have to make for each route. I ended up not trusting it. I bought a garmin 660lmt a couple of weeks back during a labor day online sale for $250.00. You put in your RV info when setting it up. It's very easy. What's the height, width, weight, length, # of propane tanks, gallons of propane etc. I have yet to use it in the RV but did put it in my truck while driving around and it works great. Gives me warnings on low bridges etc. Also gave me a warning that I had to shut my propane before getting on the NJ parkway. Interesting enough, it's not illegal to drive on the parkway with propane turned on. But the warning was enough to at least let me know it will warn me about possible laws in other states. On my 2nd RV trip my phone GPS took me a different route back home in PA. I followed it with concern, but still followed it. I'm glad it was early because it took me into a tiny town down a 1 way road with a very old bridge, only 10ft high. I would never have gotten under it. It took me 15 minutes to turn the rig around and go back down the road the wrong way. That's when I seriously started looking at RV only gps. My RV is 12 1/2 foot high, when you start going under 13.5 bridges your nerves get a little shaky hoping the town did not mess up the sign. Going under and looking up out the window is scary with those lower bridges.