I have fitted the bracket of the type that screws into the gas tank filler cap. Then I put a double cigarette lighter socket under the seat and a relay by the toolkit. The relay runs off the registration plate light and takes 150milliamps. The power feed to the relay contacts is via a 5amp in line fuse
The cable is routed behind the fairing by pushing it in - no fairing removal necessary - it pops up in front of the tank
My tomtom has the radio connection that shows traffic jams etc, so I bought a spare lead and wired it into the bike permanently
As soon as I turn on the ignition, the number plate light comes on and I hear a click from the relay under the rear seat and the GPS is live ! No switches coz I would forget those
I have 1 mile on the clock now from going up and down the drive. Bloody Wisconsin winter - come on 50 F !