I upgraded the RES radio in my 2013 to a Kenwood DNX575S w/ Garmin navigation. I've read that since the RES had SiriusXM that I will not need a separate GPS antenna. But the RES only had white (AM/FM) and yellow (sat radio) antenna connectors. Would the unused GPS antenna cable be tucked in the dash behind the radio? Or do I need to use a separate GPS antenna for the Kenwood?