Ok I am not tech savvy when it comes to using electronics devices such as tablets, I phones for onboard Navigation. At this time the wife & I use , Google Maps, folding maps, states Atlas & Gazetteer & a small Garmin 64 st GPS handheld unit, it works great but the screen size is way to small. I have watch many video's & read many post on offroad navigation systems using tablets but I am still confused about if you have to have a cellular service with the tablet to be a navigation system the videos & post seem to not mention this in detail. Another question is, what is the best tablet, size of tablet for this purpose & user friendly offroad app's & does those app's cover all national forest areas to be downloaded since the wife & I use these areas mostly. Can you down load app's from your home computer to the tablet w\o cellular service & actually use the tablet as a navigation system? What would be the best mounting system for tablet that can be removable but is solid. I looked at the Magellan TRX and TR navigators & it seems to have more con's than good about their product especially their customer service. Can some one please explain this in simple layman's terms.