Gps navigation system

project is all about navigation various objects with 95%+ accuracy. 'gps module will recieve signals from satalite and transmit these signals to the base station through gprs. where on the base computer we have to map the gps point and send the cursor to the location as mapped. so i need how to perform this task. and i also need such a degital map which can detect even buildins like microsoft degital map. also need gps software