Also, make sure on the iFly 720, you have it set to listen to the NavWorx. Once the wifi is connected, open up the iFly GPS app and touch Menu, About, Connected Device and set the Select Wireless Device to NavWorx. You should see some data start showing on the screen. If you don't see and heartbeats within about 30 seconds, try using the iLevil option, but not the Levil AHRS.
As for the 520, you just need to connect the USB and then power on the NavWorx and iFly520, it should auto establish after about 30 seconds. If not, give our support team a call as there may be a firmware update to help resolve this.