RE: Electronics Question
We're really happy with it. I would recommend the 10" screen version to anyone contemplating buying one. Unfortunately the 10" unit wouldn't fit on our retractable mount without making a bunch of modifications to the mount that I didn't want to make, so we went with the 7" version. Given how close the display is to the helmsperson, the 7" is actually just fine for our application, but I would still recommend the 10" to someone who has the space to mount it.
My only complaint with the NavNet is that in the plotter chart display mode, so far as I've been able to determine, there is no way to increase the size of the waypoint text labels. They are very small and with older eyes, reading glasses are a must if one wants to read the name of the waypoint on the display. We've not found it to be much of an issue since we rarely need to get the waypoint name off the chart anyway, but it would be nice to be able to increase the font size on the chart display.