Done 11 years ago.
Our GPS is under the dodger
, in the cockpit
, and the nav computer is in the back cabin
. I took the Garmin
"NEMA out wires", and spliced in a 20' piece of wire... (multi conductor, in twisted and shielded pairs). This was connected on the other end to the Compaq USB port's, "data in" wires. None of the color coding is the same!
The solder splice & heatshrink part was easy, but there were three real challenges.
#1 Call Garmin
and get their tech people to give me the function/definition of the wire colors, after the plug
that connects them to the unit. The question baffled them!
#2 Call Compaq, and try to get the correct function/definition of their pin placement on it's USB port. They were also baffled by the question!
Four hours later... #3 The REAL bitch: Trying to find (multi conductor wire cable, in twisted and shielded pairs). This was what was specified. I finally was given a 20' run of it, that had been salvaged out of a fighter jet. This search took a two days search!
Hopefully you will have better luck... It has worked great ever since.