DrRon,
I tried the '13 Nav hack myself a week ago, and it didn't work at all. When I throw the switch, its light comes on and I hear the relay click, but nothing happens to the Nav. I have tested it many times and many ways, and also pulled the Nav several times to inspect the wires and connectors, but I found nothing wrong with my installation. I've messaged with Bluer and he has no idea why his works and mine doesn't. The only difference between our Navs is that I have the AHA upgrade and his is still on order.
If you haven't tried the hack yet, I would recommend against it. If you have and it works, I'd certainly like to know.
Bud