So I learned a ton restoring a 94 W124 wagon. Its now running great after replacing the heater blower motor, head gasket, fuel pumps and water pump and tons of misc stuff..And it will be my daily workhorse car. A joy to drive and economical..But it wont last forever and I have a W211 coming which has been beautifully maintained, but it does not have the cool Nav system.

Im hoping to purchase a device/system that will put the car in business with maps and tracking and location search..using the car's digital screen as offered by Mercedes at purchase. I had a quick look on Ebay and see systems for sale but the details arent clear and my car has the original radio and screen which I dont want to replace..

Ive noted on several carfax histories that the shop, at some point, will install and set up the Nav system for an owner. I hope a nav system can be added on my car..Preferably DIY for reasonable dollars..

Thanks, you who know all about this new stuff..Im sure you are way ahead of me and can point in the right direction.