It is not an Expedition problem, it is a B&G problem. B&G does not allow for Expedition being the navigation source, despite all their claims. 
The H5K ignore it.
The Hercules (new H5K) claims to work since the last software release, but it does not.
Use the "instruments" in the exchange panel, there is a video out there for the Zeus2, and applicable to the Zeus3 (depending on the code you are running)
LOTS of people out there with the same pain.