Thanks for moving the threads.
Anyways in india the gps device will point to a nearest point of interest(POI) only (unless you intend to visit that POI itself). As post offices do no have a single street and location number identifier assigned to an address like
for e.g. in US "571 ,Atlantic Avenue, Hoffman Estates, IL, 60169 will be the building/house # 571 on the Atlantic Avenue Street in Hoffman Estate city and in Illinois state.
This detailed information is not available in India. The above address in indian version will be
'571 Atlantic Avenue, Behind Dominicks store, opposite basket ball court.......blah blah blah