How to Install OEM Nav to 2015 EX-L

What are the options for installing oem nav into an EX-L?
Do you need to Install antenna? Do you need additional equipment or parts for the head unit or you just need to reprogram it?
 
you need the whole unit...and a bunch of other items. It's something like 4k at a "discount" from honda. I could look the part up, but it's like a 4800 msrp or something on just the head unit needed. It's not just a reprogramming thing.
 
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