One clarification -  The Wifi uses a USB connector, but only for the physical aspect of the connection – it is not using USB standards as the electrical interface.  The RS-232 Display port connects to the Wifi.
Call NavWorx and ask for Bethany.  She can answer most questions on the install.  Mine came with a 2 or 3 page install and set-up sheet that showed how to hook up the Wi-Fi dongle.  My original Dongle only supported one device using a static IP.  Their new dongle supports DHCP and multiple devices.  They upgraded mine to the new one, which connects the same.  I have that sheet out at the hanger.  I checked with them today and there is a new SW version for the 600-B, 4.0.7.  Beth sent it to me and I will be loading that tomorrow.
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