Nav4All itself is a (currently free) map and navigation MIDP applet, and will only run on MIDP (J2ME) capable cellphones, not on IT series tablets.

Their tracing and tracking server is not available yet, at least not for free - and whenever it will, it may be Windows only, given that they state on that demo page that it "must be started from the Windows system tray". And I doubt that they will allow T&T within their free service - T&T without consent of the traced person is illegal, and they may want something more formal than a free subscription to avoid being sued in cases of abuse.

Sevo