My experience is a little different, having bought three of their NavNet3D black boxes to provide MFD functionality at 10 screens on my boat (1 in cockpit, primarily for fishing, 1 in tower, 4 in pilothouse and 4 at flybridge, plus mirrored to salon screen and MSR screen). About 7 years into my ownership of those black boxes, the video cards started to fail. Furuno stopped making / selling them. The black boxes became useless within 10 years after my purchase (and since I was an early adapter, the guys who came after me were out in the cold much earlier). My solution was to replace the black boxes with PCs running Nobeltec TZProfessional -- which is essentially the same software that the black boxes were running, but with a few extra features. Now, however, I have replaced two of those PCs with 5 MFDs -- 1 cockpit, 1 tower and 3 PH).