AUX-IN + Aftermarket navigation
 

I have just received the AUX-IN MOD and I want to use it together with my TomTom GO910 Navigation as an MP3 player. I have found enough information on how to route the wire from the unit to the glove box, but nothing on routing the cable from an aftermarket navigation that is attached to the windshield.

I am planning to have both the wire from the unit and the navigation routed to the glove box so I can plug in any other MP3 player if I want to in the future (and also put the ground loop eliminator in between if needed).

Any suggestion on routing the cable from the NAV? Should I get the ground loop eliminator right away?