1) Will Ariadne GPS work with ONLY wifi access (e.g., no cell signal)? I only have an iPod Touch 4G and was wondering if I could use Ariadne GPS on my wifi-enabled university campus without having to have cell phone access. Has anyone ever used Ariadne GPS on wifi alone and has it worked? 2) If this does work, once I pay for / download the app, will I have to pay for the maps or anything else that goes with it? Thanks.