Chozo

Tricky.. there may be a way but it would depend on the specifics of the iPads involved. It is possible to prevent apps from being deleted [iOS 4.2.1 and up], on board GPS could be used to create a virtual fence alarm or in the event the ipad leaves the area of the Access Point(s) assigned to it then the ipad itself starts screaming for help.

Alternatively just sign up for a free account with the likes of X10hosting or 000Webhost and get a gigabyte of free web space on a real web server. After all nothing beats real world testing especially as your scripts get more complicated.

Bit-sys.com did have a free android app called 'Wifi Agent' that would log hotspots as kml map data they may be a good place to start looking