GPS + Sirius: both audio outputs into 1 aux input?

[BrianA]

My car's head unit has one 3.5mm aux input jack, which I currently use for my Sirius Sportster radio. I just bought a portable GPS/mp3 unit that I'd like to have share that same aux input. That way I don't have to keep moving the aux cable back and forth between the two units depending on which device I'm using at that moment. Is that even possible? I've been told I need a mixer, but most I see out there have an AC power adapter. I was hoping someone here may have a trick up their sleeve... surely I'm not the first to attempt this ;-)

Thx!

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[AVSTANG02]

http://www.radioshack.com/product/index.jsp?productId=2476725&cp=&sr=1&origkw=3.5mm+y&kw=3.5mm+y&parentPage=search

something like this make sure it is 1 stereo to 2 stereo tho you dont want one that splits the signal to l and r mono.