If you use a portable ADS-B receiver such as the SkyEcho 2 with your EFB app, AvTraffic will now merge its own traffic sources with the receiver's traffic for a more complete picture.
To enable this, go to the Options screen and switch on the "Portable ADS-B" switch.
The status page will have an extra Service line showing the receiver and its target count. Don't forget you need to be connected to the receiver's WiFi network.