another option

https://www.imarineusa.com/ActisenseA2K-SBN-2.aspx

He is wanting to add the ability to control his Fusion with his Garmin. Not create a backbone for a ship. Anyway the Amazon link I listed is perfect and expandable if needed. As far as power. It should not be integrated into the key. It needs power anytime the battery switch is giving power to the dash. I would look under the dash and wire it to something that has power when the battery switch is on or just to where the radio gets its power. Sometimes the radio is powered through a switch on the dash that is fused. That will work fine. If your power is not coming through a fused source then you need to add a 5 amp fuse in line. Reason for skipping the key is you want to have power to the network at anchor. A bit more complex but this is my setup. Any screen can control the radio which is a Fusion connected to the backbone.

https://mightytext.net/zVrZEs

Chris

so he can add a power drop, 2 terminating resistors, 2 t's and 2 drop cables. or a 4 or 8 port of the actisense unit.... same end result different way to get there...

Same result but different price. Most boats on here will never run more than 2 screens and a Radio. So even if he needed another T my choice would be cheaper.

Chris

price point you are absolutely correct... it was just another option. I think it’s a cleaner install but to each their own.

Thanks for the info guys. I’ll run it off the radio power most likely as it is switched.