That can happen if you aren't out in the open where the GPS signal can reach the receiving antenna.
No need to check network as SV GPS is on serial port 5, check that port status...
That means you have ZERO data from the GPS puck.
If you had data, but no GPS lock, you'd have a flashing "?" on the screen.
The GPS puck is one of our most reliable products, so wiring is first on the list. Assuming you didn't mess with the default settings on the screen, there's nothing to change from when it ships.