Because standard Map Dowsing is soooooo 20th. Welcome to the 21st century, welcome to Google Maps Dowsing.

Map Dowsing works on the assumption, that a pendulum (or any other swinging object) can respond to questions in the mind of the dowsing with binary (that is: Yes/No) answers. So once can – for example – ask, whether above a certain location underground freshwater is located, and the pendulum will present it’s answer by the direction of it’s swinging movements.

Google seems to have all the answers, which are globally asked; it’s seems a logical step, that Google Maps must also be able to answer our questions.