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Originally Posted by dstankov
Two things you may want to consider is the GPS is based off satellites and to use the iPad for navigation you are going to have to depend on a reliable WiFi signal. What happens if you get into an area where your service does not provide WiFi? Also, since the use of WiFi is considered cellular data, does your service allow unlimited data, will they throttle you back after reaching a certain level of data use and if you don't have unlimited what is the charge for going over the plan allowance.
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You are mixing your technology metaphors here! LOL
WiFi signals (e.g. access points to local internet connectsion) are
never considered part of your cell phone's data plan (unless, of course, if the cell phone is actually providing the WiFi access; e.g. a hotspot).
A WiFi only iPad would not be able to be used on the road unless you can provide a local hotspot (WiFi) connection to the internet (many cell pones can do this). Of course having your phone provide the local hotspot does mean any data used here will count against your phone's data limit.
An iPad with WiFi + Cellular can but even then if you drive in an area with no cell phone coverage the online maps will stop functioning (Google maps does provide a way to download maps to the Google Map app but the trip routing feature doesn't work with downloaded map information). In this case the iPad is using the cellular network directly and does count against the plan's data limit.
iPads with cellular do have a GPS receiver in them (they do make use of WiFi internet connections to make the positioning more accurate--which you can turn off).
For our trip to FL we had no connectivity issues with the iPad (with its cell signal, of course we stuck to interstate freeways for the whole trip).
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