Map Jamming is a participatory intervention in navigation systems. In this performance visitors are invited to the gallery space and asked to open Google Maps on their smart phones. They are then asked to navigate to a pre-determined location. In the room hidden GPS device hijacks all the smartphones in the gallery space. Even though the visitors are standing still, their phones appear to be moving on a highway. Google Maps uses this motion data from smart phones to determine the traffic congestion level on roads. Green colour stands for ‘no traffic’, and red colour usually indicates delays. This activity enables us to turn a green-indicated highway red, simulating high traffic intensity on Google Maps, even though nothing has physically changed on the road. With an increasing number of people participating in this activity, we are able to strip the virtual layer providing the information how we interact with our physical space. The performance lasts for about 15 minutes.