The Becker Pilot map is the official plug in GPS for in the glovebox of Mercedes.
In many country's like for me (in Belgium) are the GPS wires standard in the CLA.
The GPS is expensive from the :mblogoblack: factory but you can buy or bid on them on Ebay or Amazon!
Look on eBay:
On eBay I have seen then going away at about 250€ when they are +750€ from factory!
See them here on ebay.co.uk or eBay.com or here in dutch
Look on Amazon:
They have them on the Amazon.com store here and in Amazon.co.uk here
Its just plug in and play. They made it like that so you can plug it out for anti-theft. I will post pictures in how the install looks, but it should be very easy.