Can I upgrade my Mazda3 with navigation?

With the exception of the icons, that looks just like the units sold by Eonon. Tha'll work in your car, and yes, you need the CanBus for your steering wheel controls and LCD display to work. Have a look at Eonon's website, they offer a warranty (I've used it once with my previous eonon HU), as well as some decent online support.

I have the D5151 - no longer available - it looks pretty much the same as the newer models, but the internals are a bit different as is the software. Still, I've had it well over a year now with no issues. I run iGo GPS software and it's good enough that I'm not loking to replace it.

Eonon also sells an Android model. There seems to be some issues with the CanBus adaptoer that may or may not have been worked out, but the software is upgradable and there are forums on the XdA (android boards) that explain how to add/remove features.
 
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