Although I can’t help you evaluate your map, I can give you some things to think about.
The accuracy of the map is greatly dependent on the technology used to identify location and the source of your data. If the data is from the base stations (the cell phone towers), then that data is not very accurate. It is not considered sufficient for emergency purposes. All new mobiles in the US have GPS technology which provide accuracy I believe within 10-15 meters. This is used for mobile E911 services and value added services (directions, friend finder, etc.) are slowly starting to catch on.
For a quick overview of location technologies, see http://www.gisdevelopment.net/technology/lbs/techlbs006a.htm .
Also, a company called ESRI has significant expertise and applications for mapping and location: www.esri.com