Adding sat Nav to my Merc C180

"Aw, sure look it." send airfare ticket, I'll come install it! Including the Executive Pack (£1,295), which adds sat nav, heated front seats and split-folding rear seats. The Premium Plus Pack (£2,995) replaces the existing display with a larger, tablet-style screen and includes the Burmester stereo. It also brings a panoramic sunroof, electrically adjustable front seats and an ambient lighting pack. Recommend choosing the £895 air-suspension.

Thanks for answer . Car is already built,.. Avantgarde fit out ie display model, so you are saying it can be changed/ added to at this stage ? Can't see executive or premium plus packages in car brochure but two sat Nav options ? PS just checked U.K. Version of car on line and has an executive and premium , in Ireland we have basis, avantgarde, exclusive and AMG and specs look quite different ?

Yes, I am saying it can be added after the factory build.

Thanks