Ok, that makes much more sense to me now. I do something similar in that I have a radar
display that takes the NEMA input instead of your repeater. It displays it on the radar screen
. I can leave the radar in stand By and thus only display the GPS data or turn on the radar for both. The display is on a swing arm that is above the nav station and swings into the compaion way so it can face the helm
. So I guess we do about the same thing.
If you find the mid point between the three devices yuo can connect the GPS wires to a bus strip for each wire. Then make connector for each wire lead to each device and connect them all up to the bus strip. You may also be able to add another connection if you have a DCS enabled VHF radio
You can get a Garmin plug
and an RS232
cable for those two devices and perhaps use the rest of the wire from the RS232
cable to run to the repeater. I would keep the wires as short as possible and put the bus strip some place handy. I added mine inside the nav station since it was close to the GPS and the computer. It's also dry.
This setup can work
fine. It should still work if the computer is off and still display on the repeater. It's nice that it works that way as you might not want to run the laptop all the time. Ialso got a 12 volt adapter for my laptop and you vcan find those on the web easy. They are a far better choice than using a inverter
to use 12 volts to make 120 volts to them make 12 volts all over again. You'll use far less power this way.
I would consider a backup GPS and set it up so you can replace the current
GPS with the back up should it fail. Norramlly you won't need the backup so it would be insurance
for the whole setup. You don't need a fancy GPS as your computer software will do more than most GPS systems.