Just wondering if it's possible to download all the maps etc. through a computer rather than the iPhone. I don't have access to Wifi and I don't really fancy using up all my Data allowance for the month.
Not at the moment, but:
So the computer you intend to use is connected to the internet? Does that have WiFi? If not, buy a cheap USB wifi adapter. Then turn on internet sharing via the wifi interface and connect your iPendix to it.