It runs quite nicely on a newish Samsung B2710 and should work on most non smart phones with J2ME (most celluar handsets) cross platform support. The main idea is the ability to still have a useful navigation tool in conjunction using a paper map when cellular network access is unavailable rather than having to rely on a GPRS connection to download Google map tiles for the GPS overlay. I haven't been able to find an Android or iOS so far that performs the same function. Navigating using just raw WGS84 lat and lon coordinates without a electronic map is possible but would be rather tiresome.