This Site is under editing. Site will be open on 25,Dec 2009
Navigation code is developed by Aishin A.W.corporation in Japan.
Japan patent pending H11-184374.
Express latitude and longitude in degree-minute-second format. Then replace degree part with text string that is a key to the record to store degree integer part of latitude and longitude.
It needs database to decode, and pre-defined combination of key string and coordinates.
In short, concept is “CityName, min, sec, min, sec”.