It's not the fault of the author, but the book is pretty much already out of date since the release of Google's Geocoder and Google's version 2 of it's API.
Akulona iphutha lombhali, kepha incwadi isivele isiphelelwe yisikhathi selokhu kukhishwe iGeocoder yakwaGoogle kanye nohlobo 2 lweGoogle lwe-API.