Consider it civilian reconnaissance. Protesters in Turkey are using Google Maps to track police movement, plot out barricades, and rally together.

Created Saturday, the map of Istanbul Police Movements centers on Taksim square, the heart of recent (and ongoing) protests against the Prime Minister Recep Tayyip Erdogan's government. It began last week with trees and a barracks. Erdogan's government plans to renovate an Ottoman barracks, a structure dating back at least a century, near the square. To get construction equipment to the barracks, officials wanted to raze trees from the nearby Gezi Park. Protesters prevented this, demonstrating in defense of the green space for over a week. Since then, protests expanded, evolving into a critique of the current ruling party.