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There is no difference in display between the RA3 and RA4. However there are different versions of the RA3/RA4. The blue/black version, the orange/gray version, and the latest 2016+ version which I believe has interchangeable backgrounds/colors.
RA3=Nav "capable". Has to be activated.
RA4=Built-in Nav + HD Radio + Sirius Traffic+Weather (subscription)
RA4 also receives TMS Traffic over FM Radio (Free)
The above is for 2016 radios. YMMV depending on the year.
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