Currently Being ModeratedFeb 12, 2013 11:07 PM (in response to Gary 777)
Though you really should contact the developer for these type of questions, my experience with it is that you need to download the maps to use it without cell service. Then it should work perfectly. You do that in Menu>Setup>Map Downloads>Download New Maps. It'll walk you through how to download maps.
Motion X Drive is great, because it does NOT rely upon the cellular network (saving you money, and works in areas with limited cellular reception).
Remember, this Support Community is for the iPad hardware, and you really should contact developers for assistance. I just happen to use the app.
Here's the tutorial on how to install maps:
Currently Being ModeratedFeb 13, 2013 6:02 PM (in response to Gary 777)
I'm not sure I know what you mean. If you download the maps, you do not need cellular at all, which means you won't be using any of your data plan. That's the point of downloading the maps.
The WiFi would be irrelevant if you're travelling, because you'd never connect to a WiFi for anything more than a second or two, and I doubt you would even do that because you wouldn't have passwords.
So whether your WiFi is on or off is irrelevant. Turning the Cellular on or off is irrelevant. With the GPS chip running, and the maps loaded, it will be very accurate, maybe up to a few meters.
You're overthinking this problem. The only reason you would need cellular is if you have a program that needs access to the internet to get map data realtime, like google maps or Apple Maps.