This is the third version of the TTN Mapper Android app. Use this app to map coverage of The Things Network using the GPS receiver in your phone. A LoRa node that is being kept in close proximity of your phone transmits LoRaWAN messages to The Things Network. This app subscribes to TTN to receive these messages. The metadata that is associated with received messages contains the signal strength and quality of the message as received by one or many gateways. This metadata is paired with your phone's location and sent to TTN Mapper. There we use this signal strength and quality data, and the location where the observation is made to draw a heatmap of the coverage of The Things Network.