In dash nav

[Rasierklinge]

First time poster her and admittedly clueless so please forgive my lack of knowledge.

I'm going to install an in dash navigation in my 07 Dodge Ram. The problem is that I don't really know what I need. I'm kind of looking for clarification here. Some double din receivers have built in gps so I'm assuming in that case all I would need is a gps entenna to make that operational? And for the ones that don't have gps built in but have the option, I need a gps module (or whatever they are called) that plugs into the back of the receiver? I'm hoping to be able to do this for around $500. I visited Best Buy to get some answers but the staff were clueless dumb *****. They told me I needed to plug my garmin portable gps into the back of the receiver. I couldn't get any answers there so I thought some of you folks could help me get this straight and maybe point me in the right direction.

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