Am I doing this right?

[bad1129]

I'm about to install a suite of Garmin electronics which is something I've never done before. For me, pulling the different cables are the easy part. It's the interconnectivity of the different devices I'm uncertain about. I've put together the attached diagram showing what I thinks needs to be accomplished to get them to talk to each other. Would someone more knowledgeable than I validate my drawing. Are there any red flags or anything I missed?

If I decide to contract it out, what would be a reasonable cost?

TIA!

[smac999]

You need fuses on each device.

If that plotter has 2 network ports then you don’t need the hub. Not sure if it does or not.