There are limitations inherent to the way in which data collection for coverage maps is carried out. Traditional coverage maps are based on models, constructed from readings taken by dedicated network testers. This often means that coverage maps show the theoretical capacity of the network rather than its real-world performance. In recent years companies such as OpenSignal and Sensorly have emerged that provide coverage maps based on information crowdsourced from consumer applications. The advantage of this approach is that the coverage maps show network reach and performance as it is experienced by its users.