Wireless link between transducer and sonar head unit?

I just found out about sonar emily and was looking at their website. Some how they seem to have off the shelf Humminbird sonar units with a wireless connection to the boat and transducer. The head unit stays on shore and can be viewed and adjusted by the user while the boat is out on the water. This is great and I’d love to get an idea of how they are doing it, anyone aware? I wonder if something like an RFD900 radio could provide this link?