Great to see this. Well done and congratulations in launching a commercial product. I have been flying Parrot Disco's on LTE and the one thing we have discovered with this is that as long as you are on the same network (Verizon, for example) latency is not an issue. I assume the same is true here -- you should not need a true external IP modem. These are almost impossible to get on US carriers.
I got bored with the Disco's and their restrictive GCS so I am really looking forward to finally using this as I have a Navio 2 sitting unused. Can I just confirm that I can use a Navio 2 to run the Ardupilot stack and UAVcast at the same time?